Add Privacy Module

[ErikReider]

Adds a privacy module that displays a indicators if the mic is accessed, any application is playing sound, and if the screen is being shared (all through Pipewire so this won't cover XWayland screen sharing).

Each "privacy module" can be enabled/disabled individually. The PR also adds 3 custom icons to use but also allows the user to specify which XDG-icon to use.

This can be extended in the future to show Geoclue status (location usage), XWayland screen share status, and camera status :)

Using the default CSS

Todo:

• Man Pages (remember to actually put it in the meson.build, cough Added gamemode man file to meson #1566 )
• Add module to README
• Add default CSS
• Update actions with dependency changes?
• Tooltips per button

Fixes: #1776

[ErikReider]

@Alexays should be ready for review :)

[Alexays]

LGTM!
Thanks for this nice addition :)
Can you update the Github wiki to add this new module?

[ErikReider]

LGTM! Thanks for this nice addition :) Can you update the Github wiki to add this new module?

Done! :)