Add playerctl support

[jlo62]

Hi, this adds support for controlling media.

supports:

• play-pause, play, pause, stop, shuffle, next, prev
• setting the player that should be controlled

todo:

• make title configureable, preferable with config file stuff
• Add config file examples

[ErikReider]

Needs rebase off of main

[jlo62]

@ErikReider This MR should be ready.

The only thing that requires testing is the installing of the config files, I don't want to install it manually on my machine as it interferes with the package manager.

[jlo62]

Should also close #116 as it adds a documented example