This makes them pass shellcheck. Except for a few unused
export warnings.
I also wonder if the majority of these files should be
in the root of the project, or should be moved to "build-scripts"
(or should still even exist).
a few minor changes
one more minor changes
Use reverse DNS naming for .desktop and .metainfo.xml as your
supposed to do nowadays according to freedesktop.org.
This also happens to match what is mandated by flatpak, so it
simplifies the flatpak post install script a little.
+ cleanup the mess that flatpak builds can leave behind when you
do a clean.
