Add AnyLinux DwarFS appimages which allow up to date dependencies on old distros

[mcarans]

I suggest adding a link to https://github.com/pkgforge-dev/Anylinux-AppImages/

These appimages use up to date dependencies but can run on old distros. They use DwarFS which produces smaller binaries that load faster. The technology seems like a natural successor to traditional appimages.