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/SettingsSidebar.ts

@@ -0,0 +1,23 @@
+import Parser from '../index';
+import Text from './misc/Text';
+import CompactLink from './CompactLink';
+import { ObservedArray, YTNode } from '../helpers';
+
+class SettingsSidebar extends YTNode {
+  static type = 'SettingsSidebar';
+
+  title: Text;
+  items: ObservedArray<CompactLink>;
+
+  constructor(data: any) {
+    super();
+    this.title = new Text(data.title);
+    this.items = Parser.parseArray<CompactLink>(data.items, CompactLink);
+  }
+
+  get contents() {
+    return this.items;
+  }
+}
+
+export default SettingsSidebar;