Par, var, begone! (#1104)

* Renamed parameters of ItemBlock subclasses

* Renamed damageDropped and getDamageValue method parameters of Block subclasses

* Removed trivially superfluous overrides of Block::quantityDropped, Block::isOpaqueCube and Block::renderAsNormalBlock

* Removed trivially superfluous overrides of Block::getItemDropped

* Cleaned up a few more block subclass method parameters

* Cleaned up obsolete Javadoc

* par1 -> block in ItemBlock Constructors

* Renamed arguments to drawGuiContainerForegroundLayer

* Cleaned up redundant casts

* Renamed arguments to drawGuiContainerBackgroundLayer

* Renamed arguments to Slot subclass constructors

* Renamed arguments to World subclass GT_DummyWorld

* Renamed parameters of updateProgressBar

* Renamed the rest of the par* parameters outside of GT_MinableOreGenerator which should be deleted

* Renamed most var1-var10 and a few more in generally non-dead code

* Renamed last varSomething variables

* Removed 3 fully dead classes used nowhere in the codebase, with obsolete unused code

89 files changed, 580 insertions, 921 deletions

diff --git a/src/main/java/gregtech/api/enchants/Enchantment_Radioactivity.java b/src/main/java/gregtech/api/enchants/Enchantment_Radioactivity.java
index cc09b5768e..f6088caab3 100644
--- a/src/main/java/gregtech/api/enchants/Enchantment_Radioactivity.java
+++ b/src/main/java/gregtech/api/enchants/Enchantment_Radioactivity.java
@@ -40,7 +40,7 @@ public class Enchantment_Radioactivity extends EnchantmentDamage {
     }
 
     @Override
-    public boolean canApply(ItemStack par1ItemStack) {
+    public boolean canApply(ItemStack itemStack) {
         return false;
     }
 
diff --git a/src/main/java/gregtech/api/gui/GT_Container.java b/src/main/java/gregtech/api/gui/GT_Container.java
index 0f788d543b..2b7959d6cb 100644
--- a/src/main/java/gregtech/api/gui/GT_Container.java
+++ b/src/main/java/gregtech/api/gui/GT_Container.java
@@ -119,6 +119,9 @@ public class GT_Container extends Container {
             e.printStackTrace(GT_Log.err);
         }
 
+        // It looks like the rest of this code should ideally never be
+        // called, and might in fact never be called.
+
         ItemStack rStack = null;
         InventoryPlayer aPlayerInventory = aPlayer.inventory;
         Slot aSlot;
@@ -158,24 +161,24 @@ public class GT_Container extends Container {
                 aSlot = (Slot) this.inventorySlots.get(aSlotIndex);
                 if (aSlot != null) {
                     tTempStack = aSlot.getStack();
-                    ItemStack var13 = aPlayerInventory.getItemStack();
+                    ItemStack mouseStack = aPlayerInventory.getItemStack();
                     if (tTempStack != null) {
                         rStack = GT_Utility.copyOrNull(tTempStack);
                     }
                     if (tTempStack == null) {
-                        if (var13 != null && aSlot.isItemValid(var13)) {
-                            tTempStackSize = aMouseclick == 0 ? var13.stackSize : 1;
+                        if (mouseStack != null && aSlot.isItemValid(mouseStack)) {
+                            tTempStackSize = aMouseclick == 0 ? mouseStack.stackSize : 1;
                             if (tTempStackSize > aSlot.getSlotStackLimit()) {
                                 tTempStackSize = aSlot.getSlotStackLimit();
                             }
-                            aSlot.putStack(var13.splitStack(tTempStackSize));
+                            aSlot.putStack(mouseStack.splitStack(tTempStackSize));
 
-                            if (var13.stackSize == 0) {
+                            if (mouseStack.stackSize == 0) {
                                 aPlayerInventory.setItemStack(null);
                             }
                         }
                     } else if (aSlot.canTakeStack(aPlayer)) {
-                        if (var13 == null) {
+                        if (mouseStack == null) {
                             tTempStackSize = aMouseclick == 0 ? tTempStack.stackSize : (tTempStack.stackSize + 1) / 2;
                             aHoldStack = aSlot.decrStackSize(tTempStackSize);
                             aPlayerInventory.setItemStack(aHoldStack);
@@ -183,29 +186,29 @@ public class GT_Container extends Container {
                                 aSlot.putStack(null);
                             }
                             aSlot.onPickupFromSlot(aPlayer, aPlayerInventory.getItemStack());
-                        } else if (aSlot.isItemValid(var13)) {
-                            if (tTempStack.getItem() == var13.getItem() && tTempStack.getItemDamage() == var13.getItemDamage() && ItemStack.areItemStackTagsEqual(tTempStack, var13)) {
-                                tTempStackSize = aMouseclick == 0 ? var13.stackSize : 1;
+                        } else if (aSlot.isItemValid(mouseStack)) {
+                            if (tTempStack.getItem() == mouseStack.getItem() && tTempStack.getItemDamage() == mouseStack.getItemDamage() && ItemStack.areItemStackTagsEqual(tTempStack, mouseStack)) {
+                                tTempStackSize = aMouseclick == 0 ? mouseStack.stackSize : 1;
                                 if (tTempStackSize > aSlot.getSlotStackLimit() - tTempStack.stackSize) {
                                     tTempStackSize = aSlot.getSlotStackLimit() - tTempStack.stackSize;
                                 }
-                                if (tTempStackSize > var13.getMaxStackSize() - tTempStack.stackSize) {
-                                    tTempStackSize = var13.getMaxStackSize() - tTempStack.stackSize;
+                                if (tTempStackSize > mouseStack.getMaxStackSize() - tTempStack.stackSize) {
+                                    tTempStackSize = mouseStack.getMaxStackSize() - tTempStack.stackSize;
                                 }
-                                var13.splitStack(tTempStackSize);
-                                if (var13.stackSize == 0) {
+                                mouseStack.splitStack(tTempStackSize);
+                                if (mouseStack.stackSize == 0) {
                                     aPlayerInventory.setItemStack(null);
                                 }
                                 tTempStack.stackSize += tTempStackSize;
-                            } else if (var13.stackSize <= aSlot.getSlotStackLimit()) {
-                                aSlot.putStack(var13);
+                            } else if (mouseStack.stackSize <= aSlot.getSlotStackLimit()) {
+                                aSlot.putStack(mouseStack);
                                 aPlayerInventory.setItemStack(tTempStack);
                             }
-                        } else if (tTempStack.getItem() == var13.getItem() && var13.getMaxStackSize() > 1 && (!tTempStack.getHasSubtypes() || tTempStack.getItemDamage() == var13.getItemDamage()) && ItemStack.areItemStackTagsEqual(tTempStack, var13)) {
+                        } else if (tTempStack.getItem() == mouseStack.getItem() && mouseStack.getMaxStackSize() > 1 && (!tTempStack.getHasSubtypes() || tTempStack.getItemDamage() == mouseStack.getItemDamage()) && ItemStack.areItemStackTagsEqual(tTempStack, mouseStack)) {
                             tTempStackSize = tTempStack.stackSize;
 
-                            if (tTempStackSize > 0 && tTempStackSize + var13.stackSize <= var13.getMaxStackSize()) {
-                                var13.stackSize += tTempStackSize;
+                            if (tTempStackSize > 0 && tTempStackSize + mouseStack.stackSize <= mouseStack.getMaxStackSize()) {
+                                mouseStack.stackSize += tTempStackSize;
                                 tTempStack = aSlot.decrStackSize(tTempStackSize);
 
                                 if (tTempStack.stackSize == 0) {
@@ -219,20 +222,24 @@ public class GT_Container extends Container {
                     aSlot.onSlotChanged();
                 }
             }
+            // Did the player try to swap a slot with his hotbar using a
+            // number key from 1 to 9
+            // aMouseclick == 0 means number 1, aMouseclick == 8 means number 9
         } else if (aShifthold == 2 && aMouseclick >= 0 && aMouseclick < 9) {
             aSlot = (Slot) this.inventorySlots.get(aSlotIndex);
 
             if (aSlot.canTakeStack(aPlayer)) {
+                // get the stack at the specified hotbar slot.
                 tTempStack = aPlayerInventory.getStackInSlot(aMouseclick);
-                boolean var9 = tTempStack == null || aSlot.inventory == aPlayerInventory && aSlot.isItemValid(tTempStack);
+                boolean canSwap = tTempStack == null || aSlot.inventory == aPlayerInventory && aSlot.isItemValid(tTempStack);
                 tTempStackSize = -1;
 
-                if (!var9) {
+                if (!canSwap) {
                     tTempStackSize = aPlayerInventory.getFirstEmptyStack();
-                    var9 = tTempStackSize > -1;
+                    canSwap = tTempStackSize > -1;
                 }
 
-                if (var9 && aSlot.getHasStack()) {
+                if (canSwap && aSlot.getHasStack()) {
                     aHoldStack = aSlot.getStack();
                     aPlayerInventory.setInventorySlotContents(aMouseclick, aHoldStack);
 
@@ -300,92 +307,92 @@ public class GT_Container extends Container {
      * merges provided ItemStack with the first avaliable one in the container/player inventory
      */
     @Override
-    protected boolean mergeItemStack(ItemStack aStack, int aStartIndex, int aSlotCount, boolean par4) {
-        boolean var5 = false;
-        int var6 = aStartIndex;
+    protected boolean mergeItemStack(ItemStack aStack, int aStartIndex, int aSlotCount, boolean reverseOrder) {
+        boolean transferredStack = false;
+        int slotIndex = aStartIndex;
 
         mTileEntity.markDirty();
 
-        if (par4) {
-            var6 = aSlotCount - 1;
+        if (reverseOrder) {
+            slotIndex = aSlotCount - 1;
         }
 
-        Slot var7;
-        ItemStack var8;
+        Slot slot;
+        ItemStack itemStack;
 
         if (aStack.isStackable()) {
-            while (aStack.stackSize > 0 && (!par4 && var6 < aSlotCount || par4 && var6 >= aStartIndex)) {
-                var7 = (Slot) this.inventorySlots.get(var6);
-                var8 = var7.getStack();
-