Base class implementing Aspose.note.Fonts.IFontsSubsystem interface. Provides functionality for default font and fonts substitutions. Override Aspose.note.Fonts.FontsSubsystem.FetchFontFamily protected member function in a derived class to implement logic for retrieving of FontFamily object....Base class implementing Aspose.Note.Fonts.IFontsSubsystem interface...substitutions. Override Aspose.Note.Fonts.FontsSubsystem.FetchFontFamily...