Added the Gradle build system and added a new native loader

src/itdelatrisu/opsu/objects/curves/Curve.java

@@ -150,14 +150,6 @@ public abstract class Curve {
 	 * @param i the control point index
 	 */
 	public float getY(int i) { return (i == 0) ? y : sliderY[i - 1]; }
-
-	/**
-	 * Linear interpolation of a and b at t.
-	 */
-	protected float lerp(float a, float b, float t) {
-		return a * (1 - t) + b * t;
-	}
-
 	/**
 	 * Discards the slider cache (only used for mmsliders).
 	 */