Hit animation bug fixes.

- In "Hidden" mod, don't draw expanding animation for circles. (related to #121)
- With "Show Perfect Hits" disabled, still show the hit animations instead of having the objects just disappear. (also mentioned in #121)
- Removed the two easing functions in Utils (and replaced references with calls to AnimationEquations).

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

src/itdelatrisu/opsu/Utils.java

@@ -654,32 +654,6 @@ public class Utils {
 			return String.format("%02d:%02d:%02d", seconds / 3600, (seconds / 60) % 60, seconds % 60);
 	}
 
-	/**
-	 * Cubic ease out function.
-	 * @param t the current time
-	 * @param a the starting position
-	 * @param b the finishing position
-	 * @param d the duration
-	 * @return the eased float
-	 */
-	public static float easeOut(float t, float a, float b, float d) {
-		return b * ((t = t / d - 1f) * t * t + 1f) + a;
-	}
-
-	/**
-	 * Fake bounce ease function.
-	 * @param t the current time
-	 * @param a the starting position
-	 * @param b the finishing position
-	 * @param d the duration
-	 * @return the eased float
-	 */
-	public static float easeBounce(float t, float a, float b, float d) {
-		if (t < d / 2)
-			return easeOut(t, a, b, d);
-		return easeOut(d - t, a, b, d);
-	}
-
 	/**
 	 * Returns whether or not the application is running within a JAR.
 	 * @return true if JAR, false if file