Move expanding of configuration to SetupProjectParameters

This allows Creator to call this explicitly which will then allow to
compare the expanded settings with those used by the project before.

Change-Id: I68aab208c4d1832c502667207054da2bcb8fa84b
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Allow installing without building.

Task-number: QBS-310

Change-Id: I22139a8c537ded6553f9dc326bb202b1b871c0ee
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
fix usage of Properties item in Qt modules

We need to provide the else case for Properties items.
This fixes the qbs build of qbs on OS X.

Change-Id: I5afeaa3d7fc7328a1c9a94575f744c212a9344ee
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>