parley: drop Source OpenType settings, simplify settings types
#506
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Sourcevariants andFrom<&str>forFontFeatures/FontVariations; Parley no longer parses CSS-like OpenType strings during resolution.text_primitives::{FontFeature, FontVariation}::parse_css_listand passing the typed lists into Parley.Cow<[FontFeature]>/Cow<[FontVariation]>for simpler, slice-like ergonomics.StylePropertyconversions from&[FontFeature],&[FontVariation], and&[T; N]; simplify resolution helpers to operate on slices and update tests.