De-duple Landmark List on Map Display

Only show one instance of the same landmark in the pop-up selector of the Map display.

Right on, I mean, this totally makes me go @_@ Sometimes when I buy a bunch of stuff from the same maker, and each package has a landmark to the shop. So then I have to weed them out. It also doesn't make sense to me that we can't more controllably show/hide and even ORGANIZE Landmarks in more flexible ways.

I definitely hope for more of that.

Sorting landmarks into subfolders in Landmarks folder should at least make them show up as submenus on the MAP. I don't make use as much of inworld Landmarks as I could because of clutter. :\