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/core/CreativeTab.java

@@ -40,7 +40,7 @@ public final class CreativeTab extends CreativeTabs
 		super( "appliedenergistics2" );
 	}
 
-	public static void init()
+	static void init()
 	{
 		instance = new CreativeTab();
 	}