Fly-Pie 23

This is the first release of Fly-Pie supporting GNOME 45. This required a major refactoring and as a consequence, this version is not compatible with older versions of GNOME Shell anymore. The old code base is still available in the gnome-3.36-44 branch and if new features are added (especially translations), they can be back-ported to this branch. Read the complete changelog!

I did some thorough testing in a virtual machine but I am sure that there will be some issues left. Please report any bugs you find!