Started creating proper levels
Changed startNextLevel() to startLevel(id)

Doors now reset on start level (in case you've been there before).
Player can now click on switch he's already at.
Added stripe to level

Removed old stepsInStairs property from level model.
Added cheat keys for changing levels
Reduced number of steps in stairs
Changed levelTransitionSpeed to resize too
Buttons in the same door position are reversed

So they actually come out in the right order!