Removed the ascii-art bar animations calculated for e.g. dunst
notifications for the controls of brightness and volume.
The dunst notifications finally have a working bar slider built into
them when invoked with the correct stack option.
amixer mutes all individual output streams when it mutes (master,
speaker, headphone) but only unmutes master by default.
This is a simple fix to unmute everything when we do.
`control-brightness` and `control-volume` both now have the exact same
progress bar indicator.
Additionally, by using the same dunst 'stack' they replace each other if
invoked in quick succession, which I really like.
`pavolume` was nice, but my own volume script is just more flexible. No
real changes yet, but includes notification through dunst and works the
same way as `control-brightness` script does, just invoked through
`control-volume`.
