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/SettingsCheckbox.ts

@@ -0,0 +1,23 @@
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class SettingsCheckbox extends YTNode {
+  static type = 'SettingsCheckbox';
+
+  title: Text;
+  help_text: Text;
+  enabled: boolean;
+  disabled: boolean;
+  id: string;
+
+  constructor(data: any) {
+    super();
+    this.title = new Text(data.title);
+    this.help_text = new Text(data.helpText);
+    this.enabled = data.enabled;
+    this.disabled = data.disabled;
+    this.id = data.id;
+  }
+}
+
+export default SettingsCheckbox;