add 'tps' command line argument

src/engine/Engine.hpp

@@ -50,6 +50,7 @@ struct CoreParameters {
     std::filesystem::path userFolder = ".";
     std::filesystem::path scriptFile;
     std::filesystem::path projectFolder;
+    int tps = 20;
 };
 
 using OnWorldOpen = std::function<void(std::unique_ptr<Level>, int64_t)>;