tldraw-zero themed follow-ups to the styles API added in #1580.
- Removed style related helpers from `ShapeUtil`
- `editor.css` no longer includes the tldraw default color palette.
Instead, a global `DefaultColorPalette` is defined as part of the color
style. If developers wish to cusomise the colors, they can mutate that
global.
- `ShapeUtil.toSvg` no longer takes font/color. Instead, it takes an
"svg export context" that can be used to add `<defs>` to the exported
SVG element. Converting e.g. fonts to inlined data urls is now the
responsibility of the shapes that use them rather than the Editor.
- `usePattern` is not longer a core part of the editor. Instead,
`ShapeUtil` has a `getCanvasSvgDefs` method for returning react
components representing anything a shape needs included in `<defs>` for
the canvas.
- The shape-specific cleanup logic in `setStyle` has been deleted. It
turned out that none of that logic has been running anyway, and instead
the relevant logic lives in shape `onBeforeChange` callbacks already.
### Change Type
- [x] `minor` — New feature
### Test Plan
- [x] Unit Tests
- [x] End to end tests
### Release Notes
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Co-authored-by: Steve Ruiz <steveruizok@gmail.com>
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