Handle SOFFSET with additional parameters

[madig]

Found this in a TSI1 table today:

<glyphProgram name="questiondown">
OVERLAP[]
SOFFSET[R], 212, 775, 539, -1.0000, 0.0000, 0.0000, -1.0000
</glyphProgram>

vttLib doesn't like it:

An error occurred while parsing "questiondown" program:
SOFFSET[R], 212, 775, 539, -1>!<.0000, 0.0000, 0.0000, -1.0000

[madig]

Probably associated with transformed components, -1.0000, 0.0000, 0.0000, -1.0000 could be the transformation matrix. Pops up from time to time before hinting and it's maybe a good idea to not implement it to prevent transformed components from slipping into the source?

[aaronbell]

Heeeeeey guess what we just discussed today.

My understanding is that transformed components are not necessarily a problem in a TTF file, but they cannot be hinted properly, so the recommendation is to decompose it. I would suggest flagging the issue to the user (though some might prefer to keep it I guess?)