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/PermanentToken.java

@@ -139,7 +139,7 @@ public class PermanentToken extends PermanentImpl {
     }
 
     @Override
-    protected MageObject getOtherFace() {
+    public MageObject getOtherFace() {
         return this.transformed ? token : this.token.getBackFace();
     }