refactor!: finish parser migration

Finally! :)

This removes all code related to the old parser.

#65

lib/parser/classes/actions/AppendContinuationItemsAction.js

@@ -0,0 +1,14 @@
+'use strict';
+
+const Parser = require('../..');
+
+class AppendContinuationItemsAction {
+  type = 'AppendContinuationItemsAction';
+
+  constructor(data) {
+    this.items = Parser.parse(data.continuationItems);
+    this.target = data.target;
+  }
+}
+
+module.exports = AppendContinuationItemsAction;