Changes:
- added experience points for solo games!
- changed tyre friction (cars have better grip)
- added one spawnable haystack in Osmicka map (cut all grass on middle roofs)
- added easter egg in Osmicka map (hint: sunflower)
- added experimental controller support
- fixed wheel upgrade for Cutter
- fixed middle collision in Column map (you could fall inside sometime)
- rearranged maps in host menu
- removed uncollectable haystacks from Osmicka map
- tested and aligned all playerstarts in Sky Blocks map (sometimes caused bugs)