DesignSpaceProcessor.splitAnisotropic() returns dicts instead of Locations

[josh-hadley]

This:

ufoProcessor/Lib/ufoProcessor/__init__.py

Line 652 in 062a1c2

locHorizontal, locVertical = self.splitAnisotropic(loc)

passes a Location object to splitAnisotropic() and attempts to use the returned results as if they were Location objects, as in:

ufoProcessor/Lib/ufoProcessor/__init__.py

Line 663 in 062a1c2

kerningObject = kerningMutator.makeInstance(locHorizontal, bend=bend)

But splitAnisotropic returns two dicts:

ufoProcessor/Lib/ufoProcessor/__init__.py

Lines 866 to 875 in 062a1c2

	def splitAnisotropic(self, location):
	x = {}
	y = {}
	for dim, val in location.items():
	if type(val)==tuple:
	x[dim] = val[0]
	y[dim] = val[1]
	else:
	x[dim] = y[dim] = val
	return x, y

When MutatorMath is in use, this causes a failure because MutatorMath is expecting a Location object, not a dict:
https://github.com/LettError/MutatorMath/blob/94b392ac20648947a37f7166d98bc6988424bfad/Lib/mutatorMath/objects/mutator.py#L226

A test case in the AFDKO test suite exposes this issue.