Added a separate Game Mods menu.

- Replaces the mods being shown in the options menu.
- Added all the (base) mod icons to the menu, with the unimplemented ones grayed out.
- Added a rotation effect to MenuButton, and now multiple effects can be set at once.

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

src/itdelatrisu/opsu/states/DownloadsMenu.java

@@ -229,6 +229,7 @@ public class DownloadsMenu extends BasicGameState {
 
 		// search
 		g.setColor(Color.white);
+		g.setLineWidth(2f);
 		search.render(container, g);
 		Utils.FONT_BOLD.drawString(
 				search.getX() + search.getWidth() * 0.01f, search.getY() + search.getHeight() * 1.3f,