* Refactor list of emoji requiring added outlines so that it can be theme-specific
* Split inaccessible emoji to emoji requiring an outline and ones that can be inverted
* Drop the “silouhettes” from black emoji as they seem to have changed color
* Add inaccessible emojis list for the light theme
* Use bordered emoji variant instead of unreliable CSS
* Fix colors of mastodon-light theme
Fix colors of modals and focused toots in light theme
Fix colors of compose-form items and more
Fix colors of status__content__spoiler-link:hover and $valid-value-color
Change success green color in light theme
* Fix some sass codes
* Add !default for explicit color valiables in default theme
for overwriting colors easier in the other themes
* Revert "Remove pointer to light theme until it is more polished (#7594)"
This reverts commit f8cf85db3b.
* True up the hierarchical structure of mastodon-light theme
* Fix mastodon-light theme
