- some dangerous casts Player/MTGCardInstance fixed

- removed typeAsTarget function and replaced with dynamic casting
- The test suite passes, but it is possible that I busted some of AI's features :(

projects/mtg/include/Targetable.h

@@ -1,17 +1,12 @@
 #ifndef _TARGETABLE_H_
 #define _TARGETABLE_H_
 
-#define TARGET_CARD 1
-#define TARGET_PLAYER 2
-#define TARGET_STACKACTION 3
-
 class Targetable
 {
 protected:
     GameObserver* observer;
 public:
     Targetable(GameObserver* observer) : observer(observer) {};
-    virtual int typeAsTarget() = 0;
     virtual const string getDisplayName() const = 0;
     inline GameObserver* getObserver() { return observer; };
     virtual void setObserver(GameObserver*g) { observer = g; };