fix(SQL): Update files concerning SQL (#224)

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-# Remove and add flags from database columns
-
-### Introduction
-
-Just like in C++, SQL also has bitwise operators that can be used to manipulate bitmasks.
-
-If you're not familiar with Bitwise operators I recommend you to go read [this article about bit operations.](https://github.com/azerothcore/wiki/blob/master/docs/Bit-and_bytes-tutorial.md)
-
-### Adding a flag to a bitmask
-
-Lets take ```creature_template.npcflag``` for this example. Our entry 12345 is a vendor and his flag is wrong. For us to fix him we need to
-set it to 128. Someone not familiar with bits and bytes would probably change the value of this npc flag
-like this:
-
-``` SQL
-UPDATE `creature_template` SET `npcflag` = 128 WHERE `entry` = 12345;
-```
-
-In reality, the best way to operate these flags would be to take his already existing flag, and add the bit 128 to the bitmask.
-We use the bitwise operator 'OR' to get the desired output.
-
-``` SQL
-UPDATE `creature_template` SET `npcflag` = `npcflag` | 128 WHERE `entry` = 12345;
-```
-
-This way, we garantee we don't lose the value that was set before by replacing it with a new one, we can also track the commit that
-made the npc 12345 a vendor and also eliminates the calculations that the developer needs to do to get his final value for the flag.
-
-### Removing a flag from a bitmask
-
-If you read the bit operations, you probably assume that to remove a value, we will use the operator 'AND' and utilize the symbol that
-inverts the bitmask '~'.
-
-If you wanted to make a creature not a vendor anymore, one would have to run the following query:
-
-``` SQL
-UPDATE `creature_template` SET `npcflag` = `npcflag` & ~(128) WHERE `entry` = 12345;
-```
-
-Graphically, this would mean that , if he had a gossip and was also a vendor, he would have flags 1 and 128 which means that it was 129.
-In other words, the bit operation would look like the following.
-
-``` C++
-     AND OPERATION
-129  - 1 0 0 0 0 0 0 1
-~128 - 0 1 1 1 1 1 1 1
------------------------
-1    - 0 0 0 0 0 0 0 1
-```