Shorthand function to modify /boot/config.txt

[amrsoll]

I am currently using this shorthand to modify / add values into /boot/config.txt

It does rely on raspi-config to get the job done. I chose to go with raspi-config as it gets maintained to work with the newer RPi versions, and it either uncomments the relevant config line or it appends a line "intelligently". This can replace the usual sed commands

Obviously, it only works if the image is RaspiOS / Raspbian, otherwise it'd be missing raspi-config

[guysoft]

Also added to wiki page recently created here:
https://github.com/guysoft/CustomPiOS/wiki/Common.sh-functions|

You are welcome to add more documentation there if you'd like to