RTLCSS Control Directive Fix + Source Maps

[SmushyTaco]

What?

This PR fixes #68364 to allow for the proper use of control directives. It stops the moving of comments and removal of comments from breaking RTLCSS control directives. It also deletes the bundled rtlcss-webpack-plugin in favor of this fork I created which has source map support and is written in TypeScript.

Why?

RTLCSS control directives use comments and if those comments are removed or moved, this will cause this to not function properly. See #68364 for more information.

How?

The issue is addressed by removing all comments only after RTLCSS control directives are processed. This is done by processing cssnano changes through it's proper webpack plugin.

Testing Instructions

Build this SCSS code:

.wp-block-create-block-my-block {
  /*!tedgfdfg*/
  /*!rtl:ignore*/
  text-align: left;
  /*!rtl:remove*/
  background: #CCC;
}

RTLCSS control directives will be correctly applied.

Testing Instructions for Keyboard

Not applicable.

Screenshots or screencast

Not applicable.

[github-actions]

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Co-authored-by: SmushyTaco <[email protected]>
Co-authored-by: Rishit30G <[email protected]>
Co-authored-by: gziolo <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[github-actions]

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[SmushyTaco]

@shail-mehta all tests have passed, could we merge this soon?

[SmushyTaco]

@gziolo would you mind reviewing this so we can merge? Everything should be good to go. Thanks.

[SmushyTaco]

@gziolo @ntwb @nerrad @ajitbohra @ryanwelcher @t-hamano this PR has been ready to merge for a month now and is important for Arabic speakers and other people with native languages that are right to left. Could this please be reviewed and merged soon? Thanks.