Implement prefixed setters

Related to #1805, this change adds an optional `setterPrefix` parameter
to the `Builder` annotation; if this parameter is unspecified or blank
the behavior of the `Builder` annotation is unchanged, but if it is
present the value specified will be prefixed to the generated methods.

For example, using:

```
@Builder(setterPrefix = "include")
class Foo {
    private int someValue;
}
```

will result in a generated `Builder` class containing an `includeSomeValue(int someValue)`
method instead of the default `someValue(int someValue)`.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/transform/resource/after-ecj/BuilderWithPrefix.java b/test/transform/resource/after-ecj/BuilderWithPrefix.java
index 21a60d0d..98c42fe9 100644
--- a/test/transform/resource/after-ecj/BuilderWithPrefix.java
+++ b/test/transform/resource/after-ecj/BuilderWithPrefix.java
@@ -13,7 +13,7 @@ import java.util.List;
       return new BuilderWithPrefix<T>(unprefixed);
     }
     public @java.lang.Override @java.lang.SuppressWarnings("all") java.lang.String toString() {
-      return (((("BuilderWithPrefix.BuilderWithPrefixBuilder(unprefixed=" + this.unprefixed) + ")");
+      return (("BuilderWithPrefix.BuilderWithPrefixBuilder(unprefixed=" + this.unprefixed) + ")");
     }
   }
   private int unprefixed;