Removed file_context, name_context, name_schema, and ranks modules
(Moved into KitCAT Project).
Wrote much simpler abx_context to replace essential features for ABX.
After discovering that sub-packages in Blender add-ons don't work (this
seems to be very broken!), I replaced the parsers subpackage with a
parsers.py module (almost as simple as concatenating the source files in
the package). I may be removing this name-parsing system from ABX
entirely, soon, possibly moving it into KitCAT.