Improved appearance of tabs.

- Replaced 'selection-tab.png' with a new image (by @kouyang).
- Simulate osu! color scheme (tab color/font color changes instead of alpha changes for selected tab).
- Added Utils.drawTab() method to avoid code duplication for Option menu tabs.

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

src/itdelatrisu/opsu/states/SongMenu.java

@@ -254,7 +254,12 @@ public class SongMenu extends BasicGameState {
 		optionsButton.draw();
 
 		// sorting tabs
-		SongSort.drawAll();
+		SongSort currentSort = SongSort.getSort();
+		for (SongSort sort : SongSort.VALUES_REVERSED) {
+			if (sort != currentSort)
+				sort.draw(false);
+		}
+		currentSort.draw(true);
 
 		// search
 		Image searchIcon = GameImage.MENU_SEARCH.getImage();