Add a dbus MPRIS control

[calebe94]

Add a script to control MPRIS Media Players.

We can use playerctl as backend, and create a interface with dmenu.

References

• MPRIS
• playerctl
• Connect and control your media player with python and dbus using MPRIS
• dbus-send
• VLC - DBus-usage
• github - popcornmix/omxplayer]
• Command to get list of all media playing
• Command to get list of all media playing
• Arch Wiki - MPRIS
• Spotify playback and volume control using keyboard shortcuts on Linux