Adds new config.ini variables (see config.ini.dist):
- fallback_domain = {if you have older RPis that dont report their fqdn correctly}
- discovery_prefix = {if you use something other than 'homeassistant'}
On older models of RPi, the GPU temp appears to be not available?
Adjusted the script to report both GPU and CPU temperatures
The system_temp is then reported as GPU but falls back to CPU if GPU is not avail.