refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/LiveChatMessageInput.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const Text = require('./Text');
+const Parser = require('..');
+const Thumbnail = require('./Thumbnail');
+
+class LiveChatMessageInput {
+  constructor(data) {
+    this.author_name = new Text(data.authorName);
+    this.author_photo = Thumbnail.fromResponse(data.authorPhoto);
+    this.send_button = Parser.parse(data.sendButton);
+    this.target_id = data.targetId;
+  }
+}
+
+module.exports = LiveChatMessageInput;