default smart pointer type switched to intrusive_ptr

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@337 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/card.hpp

@@ -24,7 +24,7 @@ DECLARE_POINTER_TYPE(StyleSheet);
 // ----------------------------------------------------------------------------- : Card
 
 /// A card from a card Set
-class Card {
+class Card : public IntrusivePtrVirtualBase {
   public:
 	/// Default constructor, uses game_for_new_cards to make the game
 	Card();