Bootstrap fixes2

[damoclark]

A range of fixes to allow appimage-builder to bootstrap an appimage of itself.

1. Updated all recipes to no longer use continuous as pydpkg library does not support non-numeric version numbers
2. Updated all recipes to add the new comp option
3. Updated the appimage-builder recipe to use Ubuntu 22.04 and Python3.10
4. Added instructions to the appimage-builder recipe for how to bootstrap build an appimage out of appimage-builder

This PR will allow the release of a new version of appimage-builder and creation of new .AppImage release file.