Small quality update - Rebindable keys, Random level mode, bug fixes

Change log:
- Added random level mode that unlocks when you complete world 6 (Steampunk).
- Rebindable keys in launcher actually work now (Thank you Anda and Intelligence).
- The first level of each world now stays unlocked when you reset your times.
- Fixed lava not killing the player on Level 10 of the desert world (Thank you r00ster).
- Fixed cacti and spiked islands (Steampunk) not killing the player.
- When you unlock a new world you are now notified at the end of the level, ie: "Snow world unlocked!".
- Player now moves the same speed backwards as forwards.
- Small optimisations.

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If you have any issues or bugs, contact me here: kiwiforgegames@gmail.com