Filter out sensors based on regex matches.
This allows removing all unit text suffixes if, for example, the panel
image already contains the unit text.
Do not append the `°C` unit to temperature sensors.
Add the unit in a separate label key with `#unit` suffix.
This allows filtering out the unit label if the panel has a graphical
representation of the unit.
The sysinfo name was too generic and misleading. This tool provides
sensor values from the system for `asterctl` and is not a generic system
information tool.
Markus Zehnder