Debian 11, bullseye: pip install problems for GPIO.

[arnoldandreasson]

There are some problems when running "pip install -r requirements.txt"
after the new Debian version: 11 (bullseye) was released.

[arnoldandreasson]

Temporary solution:

• RPi.GPIO is removed from requirements.txt
• "python3 wurb_rpi/control_via_rpi.py &" is removed from "wurb_rec_start.sh".

Motivation: GPIO is only used by people that are connecting switches/buttons to the GPIO pins.
It is better to have it disabled as default and let people using it turn it on.

[arnoldandreasson]

Checked in to the master branch for testing.