BLF: Embolden Correction & Comments #112592
Slight corrections to embolden, mostly removing any vertical expansion
and better matching "wght" variable axis. Also improved comments for
all the glyph transform routines.
Corrections and improvements in anticipation of font change. Embolden better matching "wght" variable axis - removing vertical changes and decreasing amount of advance change.
Comments remove mentions of comparisons to DejaVu. All the glyph transform routines get better comments, including blf_glyph_transform_monospace to better explain when it is needed.
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