skidlocked v1.0.1

Hi there! Hope you're all enjoying the game :) I've implemented a few fixes & changes:

• Implemented save functionality: hold f10 to reset save
• Optimized performance slightly, game should now run slightly more consistent on lower framerates
• Fixed sorting issue on minimap
• Fixed shadows being lower resolution than they should be
• Slightly tweaked the slowdown you get from going onto the sidewalk

- Aran