GUI: improved double faced tokens:

- added tokens support in test render dialog;
 - improved PT drawing;
 - fixed broken second side switch button (related to #10231);
 - fixed miss override in TokenImpl (all override with backFace must be removed, see todo);

Mage/src/main/java/mage/game/permanent/PermanentImpl.java

@@ -609,7 +609,7 @@ public abstract class PermanentImpl extends CardImpl implements Permanent {
         return true;
     }
 
-    protected MageObject getOtherFace() {
+    public MageObject getOtherFace() {
         return transformed ? this.getMainCard() : this.getMainCard().getSecondCardFace();
     }