Warning, GIGANTIC COMMIT!

Replaced Keyframe subclasses with Generic Types of Keyframe and replaced all instanceof calls
Replaced implementations of Linear and Spline interpolation to interpolate any Object that extends KeyframeValue and contains at least one public double Field. I'll need this for Keyframe interpolation in CustomImageObject Transformations
Made MarkerKeyframe *no* subclass of Keyframe to avoid conflicts with PositionKeyframe in instanceof checks for Keyframe#getValue
Created KeyframeList which extends ArrayList to provide some helping functions which DRY up the ReplayHandler
Split up ReplayHandler's keyframeList into timeKeyframeList and positionKeyframeList

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

@@ -0,0 +1,20 @@
+package eu.crushedpixel.replaymod.holders;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+import java.awt.*;
+
+@Data
+@AllArgsConstructor
+public class Transformations {
+
+    private Position anchor;
+    private Position position;
+    private Position orientation;
+    private Point scale;
+    private float opacity;
+
+    private float width, height;
+
+}