client tab refactor

[modgethanc]

this PR makes a pass on client ui/screens classes, cleaning up the code for tab handlers to make it easier to add new features and tweak existing ones.

changes:

• moves all game tab stuff (including gameprompt) into their own classes in ui.py
• adds a scope handler to the WITCH tab, which displays a list of object names in scope (okay i guess this is a little more than just a refactor but i was on a roll)
• preps for settings pane stuff by introducing user config (includes ability to customize mini panel layout in the game tab)

[vilmibm]

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