Gsystemctl

- add icons & desktop file

- add system command (menu)

- add long description for python setup

- enable column sorting

- new dialogs
- systemctl running in separate thread
- systemctl indicator
- new systemctl commands
- add case sensitive filter
- settings
- autosave/autoload the components states

- new Gtk4 ui
- better systemctl for newer versions
- add filter
- add statusbar
- add parameter input dialog for 'special' units