A small update with a lot of small changes:

- added colorblind modes
- added shortcuts (people with german keyboards can swap Z and Y in options)
- added new leaderboard
- added easter egg
- changed options screen
- changed challenge 3000 -> challenge 2900
- fixed bug with black box 4
- fixed losing saves if the game crashed on the first launch
- fixed bug with loading trigger's state
- fixed bug: local statistics didn't update when you've found solution better than global one

Have great Christmas and New Year!