new file: OldStandard.fontspec, updated naming schemes in BoldItalic

[OldStandard] / fontspec / OldStandard.fontspec

\defaultfontfeatures[Old Standard]
        {
        Extension           = .otf,
        UprightFont         = OldStandard-Regular,
        ItalicFont          = OldStandard-Italic,
        BoldFont            = OldStandard-Bold,
        BoldItalicFont      = OldStandard-BoldItalic,
        SlantedFont         = OldStandard-Regular,
        SlantedFeatures     = {FakeSlant=0.25},
        BoldSlantedFont     = OldStandard-Bold,
        BoldSlantedFeatures = {FakeSlant=0.25}
        }