Add a new struct to include the stream info and save it in qsettings
Merge branch 'devel' into features_recentfilelist

Conflicts:
	source/app/SubWindowHandle.h
	source/app/plaYUVerApp.h
Improve saving of custom struct in QSettings
Minor code arrangements
Merge branch 'devel' into features_recentfilelist
Support to save custom values. Add stream info struct in order to save relevant info about each sub window
Improve about dialog
Use previous saved stream open to open recent files