bench update - banners for Normans and Andalusians

Over the past few days I've done some flags research, and Wikipedia has been the best resource.

I've selected two "Sicilian Normans" banners, and have used both of them!

Research shows that the Andalusians were mostly just using a plain white silk banner, so I've added one of those to denote a different CvGen element than the big square option.