This removes some leftover Python code that still used the old display_*
calls for drawing instead of ctx.

We are now left only with display_update, which we will replace by the
new graphics stack soon.

Stupidly large diff, I got carried away.

This makes the simulator one step closer to be usable: we now have
petal input and an actually fast UI/renderer.

This implements a basic Python simulator for the badge. It currently
can't do much other than just displaying the main selection screen, as
it implements no inputs.