feat: add settings page parser (#154)

* feat: add settings page parsers

* fix(AccountManager): small ts error

* feat: add `CopyLink` & `SettingsCheckbox`

* deps: remove “flat” dependency

src/parser/classes/CopyLink.ts

@@ -0,0 +1,20 @@
+import Parser from '../index';
+import Button from './Button';
+import { YTNode } from '../helpers';
+
+class CopyLink extends YTNode {
+  static type = 'CopyLink';
+
+  copy_button: Button | null;
+  short_url: string;
+  style: string;
+
+  constructor(data: any) {
+    super();
+    this.copy_button = Parser.parseItem<Button>(data.copyButton, Button);
+    this.short_url = data.shortUrl;
+    this.style = data.style;
+  }
+}
+
+export default CopyLink;