Update qbs submodule.

To HEAD of master branch. Also adapt QbsProjectManager to API changes.

Change-Id: I22eb0c0966685fc26a3c6c143fd3d2d5cb4fab8d
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
QbsProjectManager: Fix signal/slot connection in QbsProjectParser.

Change-Id: I6f56dc7bb17cd1bbf9dd56763937d878fce0dda8
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>