refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/ChildVideo.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const NavigationEndpoint = require('./NavigationEndpoint');
+const Utils = require('../../utils/Utils');
+const Text = require('./Text');
+
+class ChildVideo {
+  type = 'ChildVideo';
+
+  constructor(data) {
+    this.id = data.videoId;
+    this.title = new Text(data.title);
+    this.duration = {
+      text: data.lengthText.simpleText,
+      seconds: Utils.timeToSeconds(data.lengthText.simpleText)
+    };
+    this.endpoint = new NavigationEndpoint(data.navigationEndpoint);
+  }
+}
+
+module.exports = ChildVideo;