Automattic Syntaxhighlighter Versions Save

• Update plugin dependencies to the latest version.

• Block: Add a bunch of display settings.
• Block: Switch to server-side rendering so that the same code that renders the shortcode will render the block.

• Blocks: Support SyntaxHighlighter block being used as a reusable block.

• Bring back support for the Gutenberg plugin for the people that are still on older versions of WordPress (pre-5.0) and are using the new block editor via the Gutenberg plugin.

• Drop support for the Gutenberg plugin in favor of WordPress 5.0's native functionality (different function names).

• Gutenberg: If a language isn't selected in the block configuration, default to plain text.

Includes changes from unreleased v3.3.0 plus:

• Make sure wp-editor script is loaded for Gutenberg.

• Gutenberg block thanks to @iandunn.
• Add a few extra keywords to the JavaScript highlighter. Props @caitp.

• Fix shortcode issues that would occur during post editing if the code contained what looked like opening HTML tags such as <?php. See this forum thread for details.

• Don't parse shortcodes inside of HTML entities, which could result in broken HTML.
• Drop PHP4 support. This should result in PHP7 support.