Implement "83pv" CMap and fix CIDFontType0 handling

Broken example: http://www.project2061.org/publications/sfaa/SFAA_Japanese.pdf

We have multiple problems here.
1. We don't support "83pv" CMap.
2. We need to access glyph widths using CID regardless whether the font is embedded or not.
3. Type 0 CID fonts are encoded in CID, not Unicode.