Updated codemirror to v4.12.

Did a lot of cleanup to limit the size of the plugin.
I kept the emmet plugin.

applications/admin/static/codemirror/addon/hint/html-hint.js

@@ -1,8 +1,11 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
 (function(mod) {
   if (typeof exports == "object" && typeof module == "object") // CommonJS
-    mod(require("../../lib/codemirror"));
+    mod(require("../../lib/codemirror"), require("./xml-hint"));
   else if (typeof define == "function" && define.amd) // AMD
-    define(["../../lib/codemirror"], mod);
+    define(["../../lib/codemirror", "./xml-hint"], mod);
   else // Plain browser env
     mod(CodeMirror);
 })(function(CodeMirror) {