libtoxcore: bump, build DHT bootstrap daemon
nixos: tox-bootstrapd service
Merge pull request #5419 from ehmry/tox-bootstrapd

tox-bootstrapd
maxima: update to version 5.35.1
wxmaxima: update to version 14.12.1
pavucontrol: use gnome icons (fixes issue #5330).
services.mpd: use systemd's user option

For some reason, mpd fails to open the sound card if using mpd's user
option. Starting mpd directly as the mpd user works for me.
Merge pull request #5435 from mcmtroffaes/feature/pavucontrol-fix-icons

pavucontrol: use gnome icons (fixes issue #5330).