[SVG] reuse SVG doc offsets on compile; remove deprecated version-1 support #2430
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This remove support for the old deprecated SVG version 1, which was never officially part of the OT spec (#2426). It also marks the colorPaletteOffsets as reserved (0), and removes support for embedded color palettes, to match the current OpenType SVG version=0 spec:
https://docs.microsoft.com/en-us/typography/opentype/spec/svg
In addition, it makes the compile() method reuse offsets from SVGDocumentRecords that point to the same SVG content, which should help with implementing SVG subsetting support (#534).