Genmon update for Raspberry Pi5 in V1.19.01

[jgyates]

The Raspberry Pi serial port on GPIO pins 14 an 15 historically have been associated with the device name /dev/ttyAMA0 and the Raspberry Pi OS setup a symbolic link alias for /dev/ttyAMA0 to /dev/serial0.

Starting with the Raspberry Pi 5 there is a new serial port that is dedicated to the Raspberry Pi system debug port. This debug port uses the device name /dev/ttyAMA10 and has a symbolic link to /dev/serial0. Since the operating system reserves /dev/serial0 for the system debug port starting with the Pi5, on Pi5 and later genmon will use /dev/ttyAMA0 instead of the symbolic link /dev/serial0. The behavior for Pi4 and earlier is unchanged.

The wiki pages, the setup script, pi version detection code, serialtest.py and serialconfig.py have been updated to support raspberry pi 5 differences.