Add possibility to easier override HP and breath engine logic by Lua (#14179)

Co-authored-by: Lars Mueller <appgurulars@gmx.de>

src/script/lua_api/l_object.h

@@ -411,4 +411,10 @@ private:
 
 	// respawn(self)
 	static int l_respawn(lua_State *L);
+
+	// set_flags(self, flags)
+	static int l_set_flags(lua_State *L);
+	
+	// get_flags(self)
+	static int l_get_flags(lua_State *L);
 };