Change the default owner of packaged files. See #129

I've introduced `appUser` to complement `daemonUser` with the default value of `root` (This should be changed at a later date). `daemonUser` defaults to the value of `appUser` and there is further scope to introduce `appGroup` etc...

Any Linux Generic Mappings use `appUser` as the owner of any files.

This is still WIP but I would like a sanity check on the present work...