Remove/replace/rebalance rarely used traitor items

[Mouse]

When I say "rarely used" I'm talking more about stuff like the cursed clown mask, which I've seen a grand total of three times, one of which was in a surplus crate before it got removed from that.  And all three of them were me.  I don't have access to any stats on what people are buying, so maybe people are just buying them in rounds I'm not in, but there are a fair few traitor items that I just never see.  Those are the sorts of things I'm talking about.