Provide a "Projector" tool for qml projects

In order to distribute a qmlproject in a quick and dirty way, it would be good if we provided a "projector" qml scene. It could be a qml scene (static exe/appbundle) which looks for .qmlproject file in its directory, parses it and launches the main qml file.

That way one can simply take a qmlproject, drop the projector(s) into the directory, zip the whole thing and send it.