This brings a fallback version check to the update mechanism,
which should be as stable as it can be.
It will allow migrating to another primary mechanism without
having to have updated the older primary mechanism too.
Change project directory structure according to application structure.
Change 'nox' configuration option to something more meaningful 'nogui'.
Rename 'Icons' folder to 'icons' (similar to other folders).
Partially add 'nowebui' option support.
Remove QConf project file.