Modifications in preparation for harbour support

Rename files and references to them to have the "harbour-" prefix. Fixed .pro
file to some degree (redid indentation without tabs for consistency), with still
work to do to detect Sailfish in a way that Creator is aware (packagesExist is
not supported).

I still can't get a proper compilation and run on this crappy laptop, but this
should be good enough for now.
I wish I could compile my comments
Kill enum, and add comments
Fix stupid preposition in qmake message
Start rewriting the ApplicationWindow

Is broken, but it seems the same level of broken than it was previously (e.g. in
both cases the system bus can't be displayed).