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

[ErikReider]

Otherwise, LGTM! :D

[ErikReider]

Also rebase off of main please

[jlo62]

I get this error when rebasing off main:

error[E0432]: unresolved import `zbus::ConnectionBuilder`
  --> src/server/main.rs:36:23
   |
36 | use zbus::{interface, ConnectionBuilder};
   |                       ^^^^^^^^^^^^^^^^^ no `ConnectionBuilder` in the root

[ErikReider]

Also, it makes my life easier if you don't force push commits and use proper commit messages :)

[jlo62]

@ErikReider I reverted the force push (I think I was rebasing off a ancient version that I hadn't updated in a while) ... I also reverted the changes I didn't do manually. glhf I'm sure I overlooked something.

[jlo62]

@ErikReider gentle ping not to forget...

[ErikReider]

LGTM! Thanks for your patience 😅