This adds trailing lines to files,
removes trailing white space in all the other lines and unifies line endings.
Additionally it formats the test code with `black`.
* Improve flatpak workflow
Move from yaml to json in order to be supported by GNOME Builder
Update dependencies
* Simplify Flatpak install process
Reduce the amount of commands to install the resources
by using a single svg instead of pngs
and using install instead of mdkir&cp
* Remove unused flatpak dependencies
* Update Flatpak dependencies
