MainMenu & Mouse-to-Spline Positioning Update (post-GMTK Game Jam 2023)

In the previous update the main menu was added. In this update the scene visuals for it have been updated. Check below for all update notes.

- Main menu scene visuals updated.
- You can practice the launching minions gameplay in the main menu scene.
- Reworked the mouse-to-spline positioning code. It's now much more accurate and also has added visual elements.
- Improved the look of all the particle effects.
- Fixed a bug that prevented fog from working correctly.