Glyph-specific entries in lib.plist should also (instead?) be allowed in glyph lib

[rimas-kudelis]

I find it a bit unexpected that some entries in the per-font "Common Key Registry" are lists indexed by glyph name.
For example, public.openTypeCategories is supposed to store mapping from glyph names to their OT categories, and similarly public.postscriptNames is supposed to store a mapping from glyph name to its postscript name.

I'm surprised and curious about why these two mappings weren't instead specified to be stored as simple strings in per-glyph lib, unlike all other per-glyph data.

If I remember correctly, I even saw a commit in one of Google's tools, which changed that tool's behavior from searching for such info in the glyph's lib to search for it in the font's global lib when the public.postscriptNames key became "common", which indicates that storing PS names in the global lib wasn't even the convention back then.