This generates much friendlier names on all my systems, e.g.
"HDMI / DisplayPort 5" rather than
"Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] Digital Stereo (HDMI 5)"
This commit implements the %devicename specifier for the volume module
for both PulseAudio and ALSA. This way, i3status will be able to display
the specific device that corresponds to the volume indicator.
Note that this is not implemented for the OSS API but is left in a state
where someone can pick it up for the future.