Refresh player with native block editor preview and local assets

Preserve shortcode rendering, normalize options, bundle the player locally,
and add reproducible packaging and WordPress integration tests.

licenses/unicode-width-COPYRIGHT-LICENSE

@@ -0,0 +1,7 @@
+Licensed under the Apache License, Version 2.0
+<LICENSE-APACHE or
+http://www.apache.org/licenses/LICENSE-2.0> or the MIT
+license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
+at your option. All files in the project carrying such
+notice may not be copied, modified, or distributed except
+according to those terms.