Merge topic branch t/select- into pu

Merge topic branch t/select- into pu

A single patch which implements the new feature.

Started on 2024-11-30.

<!--

The special argument '-' to the select subcommand now reactivates
the previous mood or playlist.

-->

* refs/heads/t/select-:
  com_select(): Support '-' to reactivate the previous mood/playlist.

# Conflicts:
#	afs.c