Add ObjectRef.hud_set_hotbar_itemcount and add TOCLIENT_HUD_SET_PARAM

src/script/lua_api/l_object.h

@@ -209,6 +209,9 @@ class ObjectRef
 	// hud_set_flags(self, flags)
 	static int l_hud_set_flags(lua_State *L);
 
+	// hud_set_hotbar_itemcount(self, hotbar_itemcount)
+	static int l_hud_set_hotbar_itemcount(lua_State *L);
+
 public:
 	ObjectRef(ServerActiveObject *object);