Assign alternate unicode values for duplicate glyphs

[kanou-h]

Assigning multiple Unicode values to each unique glyph image will decrease the size of the font file.

Possibly lines 62-71 of forge_font.py can be rewritten as:

other = other - set(care.values())
if len(other) > 0:
glyph.altuni = [ ord(o) for o in other ]

And I suggest the use of glyph.simplify() to remove redundant points
from each glyph.

[LingDong-]

Thanks so much for the suggestion!
I managed to reduce the size of qiji.ttf by 20% by assigning multiple unicode values to glyphs!

There is a 5% further improvement by using glyph.simplify(), but since it's hard to evaluate how much it modifies the shape I didn't want to risk it. I did add both optimizations to qiji-fallback.ttf, since they're randomly generated anyways.

The woff2 files didn't see much of a reduction though (5.2MB -> 5.1MB)

But still, pretty neat! Thanks for bringing this up. I've updated the releases, and committed 055a5dc