[font] expose LoadHeadTable #163
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When you want to process a font file, you have to parse the 'head' table first. The issue is that some macos bitmap fonts use the 'bhed' table instead.
We use an helper function
loadHeadTableto handle this complexity. It may be used by libraries which want to manually inspect a font file, but it was hidden in #130 by mistake.This PR fixes the issue and exposes this helper back.
This is backward compatible, with no changes for GUI toolkits end users.