Cleaned up ForgeWorld, AbstractWorld.

Change block setting method in Forge to a more proper one.

src/main/java/com/sk89q/worldedit/internal/LocalWorldAdapter.java

@@ -82,7 +82,7 @@ public class LocalWorldAdapter extends LocalWorld {
     }
 
     @Override
-    public boolean setBlock(Vector position, BaseBlock block, boolean notifyAndLight) {
+    public boolean setBlock(Vector position, BaseBlock block, boolean notifyAndLight) throws WorldEditException {
         return world.setBlock(position, block, notifyAndLight);
     }