Merged 'New Qt quick App' and 'Import Qml App' Wizards

Merged 'New Qt quick App' and 'Import Qml App' Wizards

The only difference between these wizards was that in the
Import Wizard, the user was able to chose a .qml file.
So, why not merge them. Also, this commit is a nice code
reduction.

The module deployment feature was killed by popular demand.
Apparently, nobody writes or deploys Qml modules, these days.
Let's see when they want to have it back ;)

Task-Number: QTCREATORBUG-2505
Reviewed-by: ck