2.5.0

Meson has been added as a build system in this release, and the
associated archive has been generated by 'meson dist'. Although
autotools has been retained for the time being and can still be used
via 'autogen.sh', meson is now the preferred build system, and
autotools will be removed in a future release.

- Update README after switchover to meson
- autotools-build: Fix wrong test operator
- meson-build: Use shared_module()
- build: Replace xdt-csource with glib-compile-resources
- Replace deprecated exo with libxfce4ui 4.21.0
- build: Automate copyright year management
- Add meson build
- Fix libxfce4panel include
- Translation Updates:
  Albanian