Display duration and progress of song in MPD

Currently this component supports basic things like playing, volume, muting and skipping songs.
Adding support for showing more information about currently playing track like media duration and position, as well as adding support for seek would be a really nice addition.
Looking at the documentation of MPD, media_duration returns ‘time’ which should according to documentation be ‘duration’, added in MPD 0.20.
Great work everyone.