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/ui/animations/AnimatedValue.java

@@ -105,7 +105,7 @@ public class AnimatedValue {
 	 * @return true if an update was applied, false if the animation was not updated
 	 */
 	public boolean update(int delta) {
-		int newTime = Utils.getBoundedValue(time, delta, 0, duration);
+		int newTime = Utils.clamp(time + delta, 0, duration);
 		if (time != newTime) {
 			this.time = newTime;
 			updateValue();