Rework rendering

Adds default, stereoscopic, tiling, cubic and equirectangular frame rendering

src/main/java/eu/crushedpixel/replaymod/interpolation/Interpolation.java

@@ -0,0 +1,7 @@
+package eu.crushedpixel.replaymod.interpolation;
+
+public interface Interpolation<T> {
+    void prepare();
+    T getPoint(float position);
+    void addPoint(T pos);
+}

src/main/java/eu/crushedpixel/replaymod/interpolation/LinearInterpolation.java

@@ -5,7 +5,7 @@ import akka.japi.Pair;
 import java.util.ArrayList;
 import java.util.List;
 
-public abstract class LinearInterpolation<K> {
+public abstract class LinearInterpolation<K> implements Interpolation<K> {
 
     protected List<K> points = new ArrayList<K>();
 
@@ -13,6 +13,11 @@ public abstract class LinearInterpolation<K> {
         points = new ArrayList<K>();
     }
 
+    @Override
+    public void prepare() {
+
+    }
+
     public abstract K getPoint(float position);
 
     public void addPoint(K point) {

src/main/java/eu/crushedpixel/replaymod/interpolation/SplinePoint.java

@@ -6,7 +6,7 @@ import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.util.Vector;
 
-public class SplinePoint extends BasicSpline {
+public class SplinePoint extends BasicSpline implements Interpolation<Position> {
     private static final Object[] EMPTYOBJ = new Object[]{};
     private Vector<Position> points;
     private Vector<Cubic> xCubics;
@@ -60,7 +60,8 @@ public class SplinePoint extends BasicSpline {
         return points;
     }
 
-    public void calcSpline() {
+    @Override
+    public void prepare() {
         try {
             calcNaturalCubic(points, vectorX, xCubics);
             calcNaturalCubic(points, vectorY, yCubics);