Store colors in `TextLayoutInfo` and extraction buffers per per glyph/slice

[ickshonpe]

What problem does this solve or what need does it fill?

With per section color storage:

1. Text extraction has to query for the TextColor components seperately, adding extra complexity to the extraction function and degrading performance.
2. A new extracted item has to be queued per color change. This will be very expensive if you have a lot of different coloured glyphs.

What solution would you like?

Store colors in TextLayoutInfo and the extraction buffers per per glyph/slice

Alternatives

We could store the colors in a separate list of (Color, Range<usize>) or something.
The synchronisation would add complexity though and for games it's common to have large numbers of small text labels where per glpyh storage should be more efficient.