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This commit introduces fluid typography block supports and switches to use the Style Engine for typography and colors. The motivation for fluid typography block supports: >"Fluid typography" describes how a site's font sizes adapt to every change in screen size, for example, growing larger as the viewport width increases, or smaller as it decreases. > >Font sizes can smoothly scale between minimum and maximum viewport widths. Typography changes introduced from Gutenberg: * Uses the Style Engine to generate the CSS and classnames in `wp_apply_typography_support()`. * Introduces `wp_typography_get_preset_inline_style_value()` for backwards-compatibility. * Introduces a private internal function called `wp_get_typography_value_and_unit()`, for checking and getting typography unit and value. * Introduces a private internal function called `wp_get_computed_fluid_typography_value()`, for an internal implementation of CSS `clamp()`. * Deprecates `wp_typography_get_css_variable_inline_style()`. References: * [https://github.com/WordPress/gutenberg/pull/40332 WordPress/gutenberg PR 40332] Style Engine: add typography and color to backend * [https://github.com/WordPress/gutenberg/pull/39529 WordPress/gutenberg PR 39529] Block supports: add fluid typography Follow-up to [53076], [52302], [52069], [51089], [50761], [49226]. Props ramonopoly, youknowriad, aristath, oandregal, aaronrobertshaw, cbirdsong, jorgefilipecosta, ironprogrammer, hellofromTonya. See #56467. git-svn-id: https://develop.svn.wordpress.org/trunk@54260 602fd350-edb4-49c9-b593-d223f7449a82