Multi-player now handles the transparent  top limiter, but the setup is to complex to ever finish.
Have to find a more simple setup to test this out.
Added button used for for simulating multi-player game.
Letting the simulate multiplayer game start a multi-player game with this peers as initiator.
Changed collision parameter for the fall through mode in limiter.
Contact between ball and top limiter is now in place, but not fall through.
Refactoring of collision categories.
More refactoring.
Using different categories for limiter left, top, right and bottom.
Started reworking the single player game to use fall-through variant of limiter.
Refactored setup for single and multiplayer game. No testing yet.
Fixed a bug that caused failure to trigger game over when ball reached bottom limiter.