Implemented a globally-visible bitmask of user input to be passed to worldThread during game loop

I have no I/O functions yet, so my debug and render variables are set from the command line.

Taking a few days because I want to perfect the absolute basics before I continue and get rid of any technical debt. Simple menu framework on the main thread will be the next step. Then a globally visible GameObject layer to be read by the renderer and animation systems in state INGAME