Added PathPreviewRenderer to draw a Preview of the current Camera Path into the World

Added KeyframesModifyEvent to be dispatched whenever the ReplayHandler's Keyframe List is changed
Refactored Event package
Reworked Settings GUI

src/main/java/eu/crushedpixel/replaymod/holders/Position.java

@@ -82,6 +82,14 @@ public class Position {
 
     public void setRoll(float roll) { this.roll = roll; }
 
+    public double distanceTo(double x, double y, double z) {
+        return distanceTo(new Position(x, y, z, 0, 0));
+    }
+
+    public double distanceTo(Position p2) {
+        return Math.sqrt(Math.pow((p2.getX() - getX()), 2) + Math.pow((p2.getY() - getY()), 2) + Math.pow((p2.getZ() - getZ()), 2));
+    }
+
     @Override
     public String toString() {
         return "X=" + x + ", Y=" + y + ", Z=" + z + ", Yaw=" + yaw + ", Pitch=" + pitch + ", Roll="+roll;