XWIKI-9698: WYSIWYG Editor Does Not Load In IE 11
* Add support for IE11 permutation (with fallbak on Mozilla implementation).

(cherry picked from commit 02b12fbca23eb673113c4b34ebd959e61dbd538e)

Conflicts:
	xwiki-platform-core/pom.xml
	xwiki-platform-core/xwiki-platform-gwt/xwiki-platform-gwt-dom/src/main/resources/org/xwiki/gwt/dom/DOM.gwt.xml
	xwiki-platform-core/xwiki-platform-gwt/xwiki-platform-gwt-user/src/main/resources/org/xwiki/gwt/user/User.gwt.xml