added miracle ability.

i choose to use other cost instead of creating a brand new cost type.

otherrestriction determines if the card is the miracle for the turn.

[card]
name=Devastation Tide
auto=all(*[-land]) moveto(ownerhand)
other={1}{u} name(Miracle)
otherrestriction=miracle
text=Return all nonland permanents to their owners' hands. -- Miracle {1}{U} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)
mana={3}{U}{U}
type=Sorcery
[/card]

projects/mtg/src/GameObserver.cpp

@@ -209,6 +209,7 @@ void GameObserver::nextGamePhase()
         mLayers->actionLayer()->cleanGarbage(); //clean abilities history for this turn;
         mLayers->stackLayer()->garbageCollect(); //clean stack history for this turn;
         mLayers->actionLayer()->Update(0);
+        currentPlayer->game->library->miracle = false;
         for (int i = 0; i < 2; i++)
         {
             //Cleanup of each player's gamezones