Reduces visibility of internal fields/methods

Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.

Reduces the visibility of internal methods to private/protected/default when possible.

src/main/java/appeng/entity/EntitySingularity.java

@@ -66,7 +66,7 @@ public final class EntitySingularity extends AEBaseEntityItem
 		return super.attackEntityFrom( src, dmg );
 	}
 
-	public void doExplosion()
+	private void doExplosion()
 	{
 		if( Platform.isClient() )
 		{