refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/MusicCarouselShelfBasicHeader.js

@@ -0,0 +1,25 @@
+'use strict';
+
+const Text = require('./Text');
+const Thumbnail = require('./Thumbnail');
+
+class MusicCarouselShelfBasicHeader {
+  type = 'MusicCarouselShelfBasicHeader';
+
+  constructor(data) {
+    if (data.strapline) {
+      this.strapline = new Text(data.strapline).toString();
+    }
+
+    this.title = new Text(data.title).toString();
+
+    // This.label = data.accessibilityData.accessibilityData.label;
+    // ^^ redundant?
+
+    if (data.thumbnail) {
+      this.thumbnail = Thumbnail.fromResponse(data.thumbnail.musicThumbnailRenderer.thumbnail);
+    }
+  }
+}
+
+module.exports = MusicCarouselShelfBasicHeader;