Use Qt pimpl in PendingUploadsModel
[utils] fix CReporterUtils::reportIncludesCrash() return value

The value returned was negated.
[core] added more special report prefixes
[sailfishui] pending uploads pulley now scrolls with the list
[sailfishui] don't group pending uploads by application name
[utils] make CReporterUtils accessible from QML
[sailfishui] display PID in the pending uploads list
[sailfishui] display signal name in the pending uploads list
[sailfishui] add report file path into pending uploads model
[sailfishui] allow to upload individual crash reports
[sailfishui] allow to delete individual crash reports