feat: color themes#863
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Adds a color datatype to Verso, as the basis for a theme feature.
Implements the color mathematics needed for automatic color theme accessibility checking (in particular, contrast and difference under colorlindness simulation).
Adds the core logic for accessibility calculations.
Adds a representation of fonts for use in themes.
Adds a first-class Lean representation of themes for rendered Lean code.
Extends code themes to TeX output
Instead of custom CSS, themes are now represented as Lean values that can be imported as libraries and selected by authors.
It now has two levels: light/dark/follow; then specific theme selection.
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This PR is in-progress work on a color theme system for Verso, especially the manual.
Steps: