Adding Wayland support made ayatana-appindicator3 a hard requirement,
which breaks on systems without it (the previous tray icon is still
perfectly usable there).

This makes it optional and auto-detected at configure time, falling back
to the tray icon when the ayatana is unavailable.

Also make sure Wayland auto-detection only gets enables when every
Wayland dependency is actually present, instead of leaking the build
flag when an optional dependency is missing.

Fixes #432

* Preparations for Wayland backend

* Use system wayland-protocols

* Implement wlr-output-power-management

* Small refactors

* Small fixes

* Add vendored wlr protocol, build fixes

* Fix crash in mate-osd-window

* Port power manager indicator to SNI

* Fix appindicator init

* Positioning brightness applet's popup with gtk-layer-shell

Original-patch-by: @lukefromdc

* Add gtk-layer-shell dep

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

The notification spec only supports a handful of tags and <br> is not
one of them.

Fixes #272

* Refers to mate-desktop/mate-terminal#487
update pot file
remove transifex configuration
remove es_ES as es exists

* retrieve last transifex translations

* add translation coverage badge

* remove empty po file

* correcting po with errors

* Refers to mate-desktop/mate-terminal#487
update pot file
remove transifex configuration
remove es_ES as es exists

* retrieve last transifex translations

* add translation coverage badge

* remove empty po file

* correcting po with errors

* correcting hu.po