Added implementations for Quaternions to represent rotation values and Interpolators using the Slerp/Lerp algorithm

We might remove this later as it isn't used and requires the Apache Commons Math Library

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

@@ -0,0 +1,18 @@
+package eu.crushedpixel.replaymod.holders;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Quaternion {
+
+    private double w, x, y, z;
+
+    public double dotProduct(Quaternion other) {
+        return (this.getX() * other.getX() + this.getY() * other.getY() +
+                this.getZ() * other.getZ() + this.getW() * other.getW());
+    }
+}