Added new type-safe cast functions.

This, when properly used, should get rid of most memory corruption issues,
currently, casting types C-style with no checks leads to some abstract crashing.
Functionality is same as with dynamic_cast<>, but with no RTTI check - so when
casting into invalid type you will receive NULL, and most probably crash.
At the same time, i took the liberty to convert most Player* casts to ToPlayer().
Still needs crapload of casts being moved to new facility.

--HG--
branch : trunk

src/game/Object.h

@@ -318,6 +318,10 @@ class Object
         // FG: some hacky helpers
         void ForceValuesUpdateAtIndex(uint32);
 
+	Player* ToPlayer(){ if(GetTypeId() == TYPEID_PLAYER)  return reinterpret_cast<Player*>(this); else return NULL;  }
+	const Player* ToPlayer() const { if(GetTypeId() == TYPEID_PLAYER)  return (const Player*)((Player*)this); else return NULL;  }
+	Creature* ToCreature(){ if(GetTypeId() == TYPEID_UNIT) return reinterpret_cast<Creature*>(this); else return NULL; }
+
     protected:
 
         Object ( );