Make a pro file based project out of the photoviewer example

Having a .pro file project is necessary to be able to deploy to
Android. Further patches for Android support will be needed, but
this is the base.

Task-number: QTBUG-38122
Change-Id: I878ec1df50d7375ae9153f8a34f763b5678d7774
Reviewed-by: Mika Salmela <mika.salmela@digia.com>
Reviewed-by: Sami Makkonen <sami.makkonen@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
Focus event fix for QQuickWidget

Relay focus in/out events to the offscreen QQuickWindow, and also
make the offscreen window believe it has the focus when the
render window has it.

Task-number: QTBUG-39033
Change-Id: Ib50b134e635833ad3813693ca272f04607c525b8
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>