Small width improvement in OpenWithDlg
Added EXE information getting functions
FileViewManager tables now store Small/Large icons for programs
QPixmap deser functions
ISubManager::PopulateModels functioing relaxation
Retrieve FileViewManager list of apps
Program retrieving in PopulateModels is expensive

Do it at a dedicated FileViewManager::PopulateSystemAppsList() function
that only runs on startup.
OpenWithDlg contextmenu, populate programs list
Implemented Filtering in OpenWithDlg

changed some context menu behaviour for it too.