Update CodeMirror to version 5.49.0 (#8381)

* Update CodeMirror to version 5.49.0

* Update CodeMirror versions in librejs and VERSIONS

public/vendor/plugins/codemirror/mode/handlebars/handlebars.js

@@ -1,5 +1,5 @@
 // CodeMirror, copyright (c) by Marijn Haverbeke and others
-// Distributed under an MIT license: http://codemirror.net/LICENSE
+// Distributed under an MIT license: https://codemirror.net/LICENSE
 
 (function(mod) {
   if (typeof exports == "object" && typeof module == "object") // CommonJS
@@ -13,10 +13,14 @@
 
   CodeMirror.defineSimpleMode("handlebars-tags", {
     start: [
+      { regex: /\{\{\{/, push: "handlebars_raw", token: "tag" },
       { regex: /\{\{!--/, push: "dash_comment", token: "comment" },
       { regex: /\{\{!/,   push: "comment", token: "comment" },
       { regex: /\{\{/,    push: "handlebars", token: "tag" }
     ],
+    handlebars_raw: [
+      { regex: /\}\}\}/, pop: true, token: "tag" },
+    ],
     handlebars: [
       { regex: /\}\}/, pop: true, token: "tag" },
 
@@ -46,7 +50,11 @@
     comment: [
       { regex: /\}\}/, pop: true, token: "comment" },
       { regex: /./, token: "comment" }
-    ]
+    ],
+    meta: {
+      blockCommentStart: "{{--",
+      blockCommentEnd: "--}}"
+    }
   });
 
   CodeMirror.defineMode("handlebars", function(config, parserConfig) {

public/vendor/plugins/codemirror/mode/handlebars/index.html

@@ -8,11 +8,12 @@
 <script src="../../lib/codemirror.js"></script>
 <script src="../../addon/mode/simple.js"></script>
 <script src="../../addon/mode/multiplex.js"></script>
+<script src="../../addon/edit/matchbrackets.js"></script>
 <script src="../xml/xml.js"></script>
 <script src="handlebars.js"></script>
 <style>.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
 <div id=nav>
-  <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
+  <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
 
   <ul>
     <li><a href="../../index.html">Home</a>
@@ -40,6 +41,8 @@
 
 {{! one line comment }}
 
+{{{propertyContainingRawHtml}}}
+
 {{#each articles}}
   {{~title}}
   <p>{{excerpt body size=120 ellipsis=true}}</p>