Removed some unneeded methods.

- Removed "isImplemented" field from GameMod as all of the base mods have been implemented.
- Removed Utils.getBoundedValue() methods in preference for Utils.clamp().

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

src/itdelatrisu/opsu/states/ButtonMenu.java

@@ -220,7 +220,7 @@ public class ButtonMenu extends BasicGameState {
 				}
 
 				// tooltips
-				if (hoverMod != null && hoverMod.isImplemented())
+				if (hoverMod != null)
 					UI.updateTooltip(delta, hoverMod.getDescription(), true);
 			}