Splits BarkeeperGump (DynamicGump) into two StaticGump<T> variants selected by body type — Human (modifiable appearance) and NonHuman (no appearance/gender controls). Each variant gets its own cached static layout via a CRTP base; dynamic per-instance text (rumor messages, keywords, tip message) is filled via slot placeholders in BuildStrings.
Moves PlayerBarkeeper, BarkeeperGump, and BarkeeperTitleGump into a dedicated Mobiles/Vendors/Barkeeper/ folder.
Pulls the Back button on the appearance-categories page out of the ModifyAppearance branch so non-human barkeepers no longer hit a dead end on that page.
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