Disable implicit animation for the window thumbnail.
No more magic strings
Better heuristics to filter out shadowing windows for Tweetbot
More flexible disovery of the window being shadowed.
Factor window enclosure and detect Tweetbot section header windows
Filter obvious sheets (mostly for Github)
Publicise API to make it easier to generalize app-specific quirks.
Factor window filters into a class cluster under NNWindowFilter
Now filters can exist focusing on a specific general problem or application.
Filters are self-contained and do not need their own headers.
More strict enforcement of filter class naming.
Check if AX API is enabled and abort if not.

The app has to be relaunched when the AX state changes anyway, so may
as well help get them half way there!