turned the "ai hint" for level up creatures into an MTGAbility.

this fixes a bug(?) that had high priority and maintains same effect as before. removed all traces of the "bugged(?) hint" from CardPrimitive.
Issue: 498

projects/mtg/src/CardPrimitive.cpp

@@ -28,7 +28,6 @@ CardPrimitive::CardPrimitive(CardPrimitive * source){
 
   power = source->power;
   toughness = source->toughness;
-	level = source->level;
 
   magicText = source->magicText;
   for(map<string,string>::const_iterator it = source->magicTexts.begin(); it != source->magicTexts.end(); ++it)
@@ -312,11 +311,3 @@ void CardPrimitive::setToughness(int _toughness){
 int CardPrimitive::getToughness(){
   return toughness;
 }
-
-void CardPrimitive::setMaxLevel(int _levelcap){
-  level = _levelcap;
-}
-
-int CardPrimitive::getMaxLevel(){
-  return level;
-}