Update for Qt5, using QtGuiApplication

:Release Notes:
Fix crash in QPainter caused by move to Qt5, by changing call of
QCoreApplication with QGuiApplication.
Add more logging to try to discover more information about other crashes.
Fix a bug in com.palm.systemservice/wallpaper/info that was giving error
if both name and files weren't specified, whereas either is acceptable.

:Detailed Notes:

:Testing Performed:
Tested on device

:QA Notes:

:Issues Addressed:
[GF-37868] QPainter is crashing in luna-sysservice

Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@lge.com>

Change-Id: I080332fc8a62c1673587db861dc7bca5f681ec87
Reviewed-on: https://g2g.palm.com/3408
Reviewed-by: Build Verification
Reviewed-by: Bhooshan Supe <bhooshan.supe@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>
Tested-by: Roger Stringer <roger.stringer@lge.com>