Add some extra variant question-mark glyphs

Add some extra variant question-mark glyphs

The inverted and reversed question-mark characters should obviously
change shape along with the normal one, so now they do.  This
conveniently tests the 'cvXX'/'ssXX' interaction without getting
tangled up with small caps as well.

Based on the different shapes of the glyphs in the Unicode code charts,
I've decided that glottal stops should not change their shapes along
with question marks, and should perhaps be different shapes entirely.