Add Transform instances to TempVars (#3020)

* Add Transform instances to TempVars

Added new Transform instances to TempVars for additional transformations.

* Update jme3-core/src/main/java/com/jme3/util/TempVars.java

Co-authored-by: Jaime Bot <jaime@rblb.it>

* add javadoc

---------

Co-authored-by: Jaime Bot <jaime@rblb.it>
Co-authored-by: Riccardo Balbo <riccardo0blb@gmail.com>

Author: 3 people

jme3-core/src/main/java/com/jme3/util/TempVars.java

@@ -202,6 +202,12 @@ public void release() {
      */
     public final Quaternion quat1 = new Quaternion();
     public final Quaternion quat2 = new Quaternion();
+    /**
+     * General transforms
+     */
+    public final Transform tr1 = new Transform();
+    public final Transform tr2 = new Transform();
+    
     /**
      * Eigen
      */