AppImage release?

[nortio]

Since this is a great tool useful to all distros, could it be possible to distribute it officially as an AppImage?

I tried this on my own:

• I first compiled the project with Qt 5.9 (the default version in Ubuntu 18.04, had to use this version, see below)
• Using linuxdeployqt I created an AppImage that bundled the Qt dependencies (the tool enforces usage of an old Ubuntu LTS version as to ensure compatibility, couldn't find any way to disable this)

The resulting AppImage works fine on all the distros I've tested, and even works on WSL2 (not sure why would anyone do that). Unfortunately, due to my garbage procedure and the Qt version, I had to remove a few things from the code (QIcon::fallbackSearchPaths() is only present from Qt 5.11 onward, with also Qt::SkipEmptyParts not working), and since this was just a random test, I didn't bother replacing them.