Update v1.18

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!