'sbix' originOffsetY applied in wrong direction, need 'glyf' offset applied.
Migrated from: [SAVANNAH-59411]
bungeman reported:
See https://github.com/MicrosoftDocs/typography-issues/issues/191 for background on clarification of the specification.
There are two clarifications:
1. Positive values of the sbix originOffsetY should push the image visually up.
2. If there is a non-empty 'glyf' entry for the glyph id, the lower left of its bounds should be used as the origin for the originOffsetX/Y.