More graphical updates, some code cleanup, and minor fixes.

- The MenuButton class now fully supports hover effects (scale, fade, rotate) for Animations.
- Used a fixed location for the selection buttons in the song menu (previously based on the "back" button width, which varies widely in different skins).
- Added hover effects for "retry" and "exit" buttons in the ranking screen.
- Changed animation speed of back/skip buttons.
- Fixed a bug where main menu showed the incorrect number of songs loaded during searches.
- Removed unneeded draw() methods in Utils for color filters (since 69f5aa5).
- Moved Utils.drawCentered(Image, ...) into the Image class.
- Added overwritten Image class to Maven excludes.

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

src/itdelatrisu/opsu/states/ButtonMenu.java

@@ -485,7 +485,7 @@ public class ButtonMenu extends BasicGameState {
 		RESET_MODS ("Reset All Mods", Color.red) {
 			@Override
 			public void click(GameContainer container, StateBasedGame game) {
-				SoundController.playSound(SoundEffect.MENUHIT);
+				SoundController.playSound(SoundEffect.MENUCLICK);
 				for (GameMod mod : GameMod.values()) {
 					if (mod.isActive())
 						mod.toggle(false);

src/itdelatrisu/opsu/states/Game.java

@@ -810,7 +810,7 @@ public class Game extends BasicGameState {
 
 		// skip button
 		if (GameImage.SKIP.getImages() != null) {
-			Animation skip = GameImage.SKIP.getAnimation(200);
+			Animation skip = GameImage.SKIP.getAnimation(120);
 			skipButton = new MenuButton(skip, width - skip.getWidth() / 2f, height - (skip.getHeight() / 2f));
 		} else {
 			Image skip = GameImage.SKIP.getImage();

src/itdelatrisu/opsu/states/GameRanking.java

@@ -84,6 +84,8 @@ public class GameRanking extends BasicGameState {
 				width - (exit.getWidth() / 2f),
 				(height * 0.97f) - (exit.getHeight() / 2f)
 		);
+		retryButton.setHoverFade(0.6f);
+		exitButton.setHoverFade(0.6f);
 	}
 
 	@Override
@@ -119,6 +121,10 @@ public class GameRanking extends BasicGameState {
 		Utils.updateCursor(delta);
 		Utils.updateVolumeDisplay(delta);
 		int mouseX = input.getMouseX(), mouseY = input.getMouseY();
+		if (data.isGameplay()) {
+			retryButton.hoverUpdate(delta, mouseX, mouseY);
+			exitButton.hoverUpdate(delta, mouseX, mouseY);
+		}
 		Utils.getBackButton().hoverUpdate(delta, mouseX, mouseY);
 	}
 
@@ -174,8 +180,11 @@ public class GameRanking extends BasicGameState {
 		if (!data.isGameplay()) {
 			if (!MusicController.isTrackDimmed())
 				MusicController.toggleTrackDimmed(0.5f);
-		} else
+		} else {
 			SoundController.playSound(SoundEffect.APPLAUSE);
+			retryButton.resetHover();
+			exitButton.resetHover();
+		}
 	}
 
 	@Override

src/itdelatrisu/opsu/states/MainMenu.java

@@ -236,7 +236,7 @@ public class MainMenu extends BasicGameState {
 		g.setFont(Utils.FONT_MEDIUM);
 		int lineHeight = Utils.FONT_MEDIUM.getLineHeight() * 9 / 10;
 		g.drawString(String.format("Loaded %d songs and %d beatmaps.",
-				OsuGroupList.get().size(), OsuGroupList.get().getMapCount()), marginX, marginY);
+				OsuGroupList.get().getMapSetCount(), OsuGroupList.get().getMapCount()), marginX, marginY);
 		if (MusicController.isTrackLoading())
 			g.drawString("Track loading...", marginX, marginY + lineHeight);
 		else if (MusicController.trackExists()) {

src/itdelatrisu/opsu/states/SongMenu.java

@@ -253,9 +253,10 @@ public class SongMenu extends BasicGameState {
 		search.setMaxLength(60);
 
 		// selection buttons
-		float selectX = GameImage.MENU_BACK.getAnimation(1).getWidth() * 1.75f;
-		float selectY = height - GameImage.SELECTION_MODS.getImage().getHeight() / 2f;
-		float selectOffset = GameImage.SELECTION_MODS.getImage().getWidth() * 1.05f;
+		Image selectionMods = GameImage.SELECTION_MODS.getImage();
+		float selectX = width * 0.183f + selectionMods.getWidth() / 2f;
+		float selectY = height - selectionMods.getHeight() / 2f;
+		float selectOffset = selectionMods.getWidth() * 1.05f;
 		selectModsButton = new MenuButton(GameImage.SELECTION_MODS_OVERLAY.getImage(),
 				selectX, selectY);
 		selectRandomButton = new MenuButton(GameImage.SELECTION_RANDOM_OVERLAY.getImage(),