Post production bug fixes & new features

Changelog:

- Added pixl games splash screen when loading the game

- Changed large dirt piles to have more accurate collision, and improved clarity with blocked pathways

- Simplified unnecessarily complex collision shapes throughout the game

- Added separate sensitivity setting for controller sensitivity

- Added settings to change the window mode (windowed, fullscreen, exclusive fullscreen)

- Fixed a bug where the FPS info box freezes after collecting the cheese at the end of a level

- Fixed scrollbars on UI to separate the scrollbar and the content