Fixing loading_screen.gd on linux and mac

https://itch.io/post/9068314

change main scene resource loading to all lowercase to support linux and mac

Persist Game Settings Across session

• Adding a game settings file that will persist the game settings (volume, display config) across sessions.
• Fixed a warning with the beach-waves.mp3 path parsing

Initial Release

Initial Release of this Godot 4+ Project Template