This update adds styles and theme support related to the new block-based editor to enhance the experience of using it with Twenty Twelve.
These are the specific changes made to this theme:
* Add blocks.css, to style blocks on the front end, to make sure they match the theme’s existing HTML element styles.
* Add editor-blocks.css to style blocks in the editor, to make sure they match the theme’s existing HTML element styles.
* Add theme support for `editor-styles`, to pull the existing editor stylesheet into the new editor.
* Add theme support for `wp-block-styles`, to load the default block styles on the front end.
* Add theme support for `editor-color-palette`, to load a color palette based on the theme’s color scheme into the block-based editor.
Props ianbelanger, crunnells, laurelfulford.
Fixes#45040.
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