- License: Relicense ext-mathjax from Apache-2.0 to MIT per https://g…

…ithub.com /josegaert/ext-mathjax/issues/6

- License: Reorder license listing in `jquery.contextMenu.js` so that more permissive is noticeable first
- License: Clarify in `@license` that `ext-server_moinsave.js` is MIT OR GPL-2.0-or-later per subsequent text
- Optimization: Remove unused `jquery-ui-1.8.custom.min.js` file

editor/contextmenu/jQuery.contextMenu.js

@@ -10,7 +10,7 @@
  * @todo Update to latest version and adapt (and needs jQuery update as well): {@link https://github.com/swisnl/jQuery-contextMenu}
  * @version 1.0.1
  *
- * @license (GPL-2.0-or-later OR MIT)
+ * @license (MIT OR GPL-2.0-or-later)
  *
  * This plugin is dual-licensed under the GNU General Public License
  *   and the MIT License and is copyright A Beautiful Site, LLC.

editor/extensions/ext-mathjax.js

@@ -2,7 +2,7 @@
 /**
  * ext-mathjax.js
  *
- * @license Apache-2.0
+ * @license MIT
  *
  * @copyright 2013 Jo Segaert
  *

editor/extensions/ext-server_moinsave.js

@@ -1,7 +1,7 @@
 /**
  * ext-server_moinsave.js
  *
- * @license MIT
+ * @license (MIT OR GPL-2.0-or-later)
  *
  * @copyright 2010 Alexis Deveria, 2011 MoinMoin:ReimarBauer
  *  adopted for moinmoins item storage. It sends in one post png and svg data