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/search/searchcursor.js

@@ -1,3 +1,6 @@
+// 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"));
@@ -104,7 +107,7 @@
             var from = Pos(pos.line, cut);
             for (var ln = pos.line + 1, i = 1; i < last; ++i, ++ln)
               if (target[i] != fold(doc.getLine(ln))) return;
-            if (doc.getLine(ln).slice(0, origTarget[last].length) != target[last]) return;
+            if (fold(doc.getLine(ln).slice(0, origTarget[last].length)) != target[last]) return;
             return {from: from, to: Pos(ln, origTarget[last].length)};
           }
         };