Implement text shaping with libraqm #30000
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Namely, `text.hinting` is now `default` instead of `force_autohint` (or `none` for classic tests) and `text.hinting_factor` is now 1, not 8.
If we've updated an image in the past couple commits, then we can remove the backwards-compatibility styling so that they're generated as intended.
The `FontInfo.num` value returned by `TruetypeFonts._get_info` is a character code, but `FT2Font.get_kerning` takes *glyph indices*, meaning that kerning was likely off in most cases.
Bundled HarfBuzz may use it, so we need to keep the names matching.
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PR summary
This is based on #29816 but doesn't yet include #29794 and #29695. I'm mostly opening it to see how CI will cope.
PR checklist