Post jam release

I received a lot of very good feedback on the jam version of One Platform. With the post jam version of the game, I have addressed most of it. I hope you enjoy this new version and please keep giving me feedback on how to keep improving it.

News:
- Updated and added levels
- Restart from level 1 by holding down R
- Added menu
- Added online leaderboard
- Added collectable stars
- Added split times
- New visuals (background, trail effects, shadows, font)

Improvements:
- Snappier movement and improved jumping controls
- Fixed issue of failing after level completion text has been displayed