refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/menus/MultiPageMenu.js

@@ -0,0 +1,15 @@
+'use strict';
+
+const Parser = require('../..');
+
+class MultiPageMenu {
+  type = 'MultiPageMenu';
+
+  constructor(data) {
+    this.header = Parser.parse(data.header);
+    this.sections = Parser.parse(data.sections);
+    this.style = data.style;
+  }
+}
+
+module.exports = MultiPageMenu;