Reset PewPew M4 when Z button is held for 5s

Clean up pew.py

Optimize out GIF errors

Add support for PewPew M4

Make audiocore import work on older CircuitPython

If there is no audiocore, use audioio instead.

Reverse joystick x and y in PyGamer

Fix OverflowError in read_palette

CircuitPython now has overflow checks, so the old code crashes.

Sleep after reset

Negate the buttons for minitft featherwing