GameEvent: remove TRANSFORM which is no longer used, and UNFLIP which is explicitly impossible under the rules

Mage/src/main/java/mage/game/events/GameEvent.java

@@ -342,8 +342,7 @@ public class GameEvent implements Serializable {
          */
         UNTAP, UNTAPPED,
         FLIP, FLIPPED,
-        UNFLIP, UNFLIPPED,
+        TRANSFORMING, TRANSFORMED,
-        TRANSFORM, TRANSFORMING, TRANSFORMED,
         ADAPT,
         BECOMES_MONSTROUS,
         /* BECOMES_EXERTED

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

@@ -43,8 +43,6 @@ public interface Permanent extends Card, Controllable {
 
     boolean isFlipped();
 
-    boolean unflip(Game game);
-
     boolean flip(Game game);
 
     boolean transform(Ability source, Game game);

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

@@ -565,18 +565,6 @@ public abstract class PermanentImpl extends CardImpl implements Permanent {
         return flipped;
     }
 
-    @Override
-    public boolean unflip(Game game) {
-        if (flipped) {
-            if (!replaceEvent(EventType.UNFLIP, game)) {
-                this.flipped = false;
-                fireEvent(EventType.UNFLIPPED, game);
-                return true;
-            }
-        }
-        return false;
-    }
-
     @Override
     public boolean flip(Game game) {
         if (!flipped) {
@@ -618,8 +606,7 @@ public abstract class PermanentImpl extends CardImpl implements Permanent {
                 || (!ignoreDayNight && this.checkDayNightBound())
                 || this.getOtherFace().isInstantOrSorcery()
                 || !this.checkTransformRestrictionEffects(game)
-                || (source != null && !source.checkTransformCount(this, game))
+                || (source != null && !source.checkTransformCount(this, game))) {
-                || this.replaceEvent(EventType.TRANSFORM, game)) {
             return false;
         }
         if (this.transformed) {