New React component: ConversationListItem, installed in left pane

When collecting a conversation's last message, we grab that message's
status as well (if outgoing) and show it.

js/modules/signal.js

@@ -19,6 +19,9 @@ const { ContactName } = require('../../ts/components/conversation/ContactName');
 const {
   ConversationHeader,
 } = require('../../ts/components/conversation/ConversationHeader');
+const {
+  ConversationListItem,
+} = require('../../ts/components/ConversationListItem');
 const {
   EmbeddedContact,
 } = require('../../ts/components/conversation/EmbeddedContact');
@@ -151,6 +154,7 @@ exports.setup = (options = {}) => {
     ContactListItem,
     ContactName,
     ConversationHeader,
+    ConversationListItem,
     EmbeddedContact,
     Emojify,
     GroupNotification,