[FR]: Add advanced calendar start/end time settings

[AndreMonthy]

Feature Description

Version I encountered this problem with.

After updating, the calendar view start time was 06:00 and the end time was 22:00. This was a jarring default change, as before the update the calendar showed the full day.

I looked through the settings to see if I could change the calendar start and end time, but I could not find an option:

I ended up having to go into the base file and changed:
slotMinTime: 06:00:00 slotMaxTime: 22:00:00

to

slotMinTime: 00:00:00 slotMaxTime: 24:00:00

My suggestion:

1. Please revert the default calendar view in the next update so it shows the full day again, preserving the previous behaviour by default.
2. Please add a setting to change this in the settings GUI, so users do not have to directly edit the base YAML file:

Perhaps name the settings Calendar start time and Calendar end time.

Thanks for your work on this plugin. It is very helpful.