Migrate messages, conversations, conversation_view, background to TS

Co-authored-by: Sidney Keese <sidney@carbonfive.com>

loading.html

@@ -19,6 +19,7 @@
       <div class="message"></div>
     </div>
     <script type="text/javascript" src="js/components.js"></script>
+    <script type='text/javascript' src='ts/backboneJquery.js'></script>
     <script type="text/javascript" src="js/loading_start.js"></script>
   </body>
 </html>