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Ubuntu Touch is temporarily not supported due to the old Qt version in UT
xenial.

Co-authored-by: Melvin Keskin <melvo@olomono.de>
Co-authored-by: Jonah Brüchert <jbb@kaidan.im>

This replaces the old libnotify-binary based notifications (executing
shell commands) by cross-platform working notifications provided by
KNotifications.

Currently the dependencies (knotifications and its dependencies) are not
built on the CI for the most platforms (android, macOS, windows, ut),
however knotifications would also work on these platforms.

Currently the failing windows build blocks all artifacts on the website.

It also adds the zsync file to automatically update the AppImage.

By default it now will use /usr as Qt install path. Also the fuse
dependency isn't needed anymore (didn't work in docker); we're just
extracting the image now (thanks to JBB).

(No I should not use merge requests and tests things before pushing to master)