Fixes #10933

Fixes #10988

Fixes #10997

Fixes #10981

Supported color scheme states/values are
  0: No preference
  1: Prefer dark appearance
  2: Prefer light appearance

https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.Settings

Fixes #10996.

There is no way for Gajim to update the plugins. Let flatpak handle this.

Allow "-" in domain part

Add more url delimiters

Use one combined regex for uris and addresses so we get no overlaps

Fixes #10974

<Primary>R show/hides the chat list

Until we can setup the deploy key

There is only one AdHocCommand offered and its more of a gimmick.

It’s better to leave this up to the window manager and don’t mess with it.
Users who don’t want to minimize to tray can either use the tray show/hide button
or set the `Action on Close` setting accordingly.

The new popover setting allows for more than two values and is a
more flexibel approach.

Conditions are listed here: https://dev.gajim.org/gajim/gajim/-/wikis/development/MUC-Invite-Logic

Ignore checks which are executed with flake8