feat: add support for topic/auto-generated channels and fix minor parsing errors (#233)

* dev: add support for topic channels

* dev(parser): do not try to parse empty nodes

* dev: add support for auto-generated game channels

src/parser/classes/InteractiveTabbedHeader.ts

@@ -0,0 +1,36 @@
+import Parser from '..';
+import { ObservedArray, YTNode } from '../helpers';
+
+import Text from './misc/Text';
+import Thumbnail from './misc/Thumbnail';
+import SubscribeButton from './SubscribeButton';
+import MetadataBadge from './MetadataBadge';
+import Button from './Button';
+
+export default class InteractiveTabbedHeader extends YTNode {
+  static type = 'InteractiveTabbedHeader';
+
+  header_type: string;
+  title: Text;
+  description: Text;
+  metadata: Text;
+  badges: MetadataBadge[];
+  box_art: Thumbnail[];
+  banner: Thumbnail[];
+  buttons: ObservedArray<SubscribeButton | Button>;
+  auto_generated: Text;
+
+  constructor(data: any) {
+    super();
+
+    this.header_type = data.type;
+    this.title = new Text(data.title);
+    this.description = new Text(data.description);
+    this.metadata = new Text(data.metadata);
+    this.badges = Parser.parseArray<MetadataBadge>(data.badges, MetadataBadge);
+    this.box_art = Thumbnail.fromResponse(data.boxArt);
+    this.banner = Thumbnail.fromResponse(data.banner);
+    this.buttons = Parser.parseArray<SubscribeButton | Button>(data.buttons, [ SubscribeButton, Button ]);
+    this.auto_generated = new Text(data.autoGenerated);
+  }
+}