refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/ThumbnailOverlayLoadingPreview.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const Text = require('./Text');
+
+class ThumbnailOverlayLoadingPreview {
+  type = 'ThumbnailOverlayLoadingPreview';
+
+  constructor(data) {
+    this.text = new Text(data.text);
+  }
+}
+
+module.exports = ThumbnailOverlayLoadingPreview;