bump crengine: support font-variant, more FB2 metadata (#1067)
bump crengine: support font-variant, more FB2 metadata (#1067)

Includes:
- FB2: merge other metadata in returned keywords and description
- CSS: adds support for font-variant
Frenzie/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,koreader/koreader-base