Uses resolver to find font programs for fonts that are not embedded, and named font resources (predefined
CMaps, CID-to-Unicode tables). Resolvers are asked in registration order, all before the operating system's fonts; the first
answer wins.
public PdfOptions UseFontResolver(IFontResolver resolver)
The resolver. Shared by every document and thread of the engine: it must keep no state between calls.
ISO 32000-2 §9.6.2.2, §9.7.5.2 and §9.8. The font resolver extension point. The Standard 14
fonts package registers its resolver with one call, UseStandard14Fonts().