Cleaned up lua glue macro a bit

zone/lua_npc.h

@@ -8,14 +8,15 @@ class NPC;
 
 class Lua_NPC : public Lua_Mob
 {
+	typedef NPC NativeType;
 public:
 	Lua_NPC() { d_ = nullptr; }
-	Lua_NPC(NPC *d) { d_ = d; }
+	Lua_NPC(NativeType *d) { d_ = d; }
 	virtual ~Lua_NPC() { }
 
-	operator NPC* () {
+	operator NativeType* () {
 		if(d_) {
-			return reinterpret_cast<NPC*>(d_);
+			return reinterpret_cast<NativeType*>(d_);
 		}
 
 		return nullptr;