refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/MusicDescriptionShelf.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const Text = require('./Text');
+
+class MusicDescriptionShelf {
+  type = 'MusicDescriptionShelf';
+
+  constructor(data) {
+    this.description = new Text(data.description);
+
+    if (this.max_collapsed_lines) {
+      this.max_collapsed_lines = data.maxCollapsedLines;
+    }
+
+    if (this.max_expanded_lines) {
+      this.max_expanded_lines = data.maxExpandedLines;
+    }
+
+    this.footer = new Text(data.footer);
+  }
+}
+
+module.exports = MusicDescriptionShelf;