remove push/get_gui_id from LuaStack

engine/lua/LuaStack.h

@@ -339,22 +339,6 @@ public:
 		return id;
 	}
 
-	//-----------------------------------------------------------------------------
-	void push_gui_id(GuiId id)
-	{
-		uintptr_t enc = id.encode();
-		lua_pushlightuserdata(m_state, (void*)enc);
-	}
-
-	//-----------------------------------------------------------------------------
-	GuiId get_gui_id(int32_t index)
-	{
-		uint32_t enc = (uintptr_t) lua_touserdata(m_state, index);
-		GuiId id;
-		id.decode(enc);
-		return id;
-	}
-
 	//-----------------------------------------------------------------------------
 	void push_gui(Gui* gui)
 	{