Suggestion: Mute between specified hours

I would like my Panda Alarm to sound when a print is finished during the daytime, but I do not want to be woken up by the noise if I leave the printer running overnight. An ability to turn off the sound between specified hours would be beneficial.

No files, tests, or implementation entry points are named. First locate the alarm scheduling and sound-control code, then clarify how the specified hours should behave; done means the alarm stays silent during that interval while still sounding outside it.

Written by the indexing model from the issue text.