make Vector2 constructor private

common/api/util/src/main/java/com/dfsek/terra/api/util/vector/Vector2.java

@@ -25,11 +25,15 @@ public class Vector2 implements Cloneable {
      * @param x X component
      * @param z Z component
      */
-    public Vector2(double x, double z) {
+    private Vector2(double x, double z) {
         this.x = x;
         this.z = z;
     }
     
+    public static Vector2 of(double x, double z) {
+        return new Vector2(x, z);
+    }
+    
     /**
      * Multiply X and Z components by a value.
      *