Changes to Italic styles:

• extend Latin character set from AL-3 to AL-4
• add Cyrillic (covering AC-2)
• add Greek (covering AG-1)

Changes to Roman styles:

• minor updates to spacing of modifer glyphs
• updates to some Cyrillic characters as suggested by external advisors
• minor updates to Cyrillic kerning
• updates to some Greek characters as suggested by external advisors

Global changes:

• overhaul ccmp feature to decompose accented glyphs when followed by combining mark, thus allowing double-stacking of accents (addresses #41, #42)
• add ccmp solution for Ukrainian її clash, also for Latin ïï (addresses #48)
• add Bulgarian Cyrillic alternates both via locl and ss01 feature (addresses #20)
• add Serbian/Macedonian Cyrillic alternates both via locl and ss02 feature

Roman and Italic styles now support the same global character set, in both static and variable versions.