[Feature request] Please add support for masking services instead of disabling

[benintech]

Is it possible to add support to mask a service, instead of just disabling it ?

I sometimes mask the avahi-daemon service on some Wi-Fi networks, because I don't want any Wi-Fi printers popping up. Just disabling avahi-daemon is of no use, because it is automatically restarded (by CUPS I think). You need to mask it.

It would be great if your extension would allow to mask a service instead of just disabling it. Ideally this should be done on a per-service basis, allowing for each service to choose if toggling the switch disables the service or masks it.