Cleanup of some lua code, initial work on encounter_quests

zone/lua_npc.cpp

@@ -3,6 +3,12 @@
 #include "masterentity.h"
 #include "lua_npc.h"
 
+#include "lua.hpp"
+#include <luabind/luabind.hpp>
 
+luabind::scope lua_register_npc() {
+	return luabind::class_<Lua_NPC, Lua_Mob>("NPC")
+		.def(luabind::constructor<>());
+}
 
 #endif