Moved most GameImage scaling/processing to a single file.

- To scale an image, override process_sub() in its enum definition.  All GameImages call the process() method when loaded.
- Skin GameImage overrides will now call process() immediately, so there's no more need for the hackish scaling status.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/Utils.java

@@ -203,8 +203,11 @@ public class Utils {
 		backButton.setHoverDir(MenuButton.Expand.UP_RIGHT);
 
 		// set default game images
-		for (GameImage img : GameImage.values())
+		GameImage.init(width, height);
+		for (GameImage img : GameImage.values()) {
 			img.setDefaultImage();
+			img.process();
+		}
 
 		// initialize game mods
 		for (GameMod mod : GameMod.values())