feat: tidy things up and implement more renderers

- Finished Library parser
- Fixed search continuations
- Improved channel parser
- Improved playlist parser
- Added support for posts of type poll
- Improved History parser
- Removed redundant code

lib/parser/contents/classes/EndScreenVideo.js

@@ -14,9 +14,10 @@ class EndScreenVideo {
     this.title = new Text(data.title);
     this.thumbnails = Thumbnail.fromResponse(data.thumbnail);
     this.thumbnail_overlays = Parser.parse(data.thumbnailOverlays);
-    this.author = new Author({ nav_text: data.shortBylineText, badges: data.ownerBadges || data.badges });
+    this.author = new Author(data.shortBylineText, data.ownerBadges);
     this.endpoint = new NavigationEndpoint(data.navigationEndpoint);
     this.short_view_count_text = new Text(data.shortViewCountText);
+    this.badges = Parser.parse(data.badges);
     this.duration = {
       text: new Text(data.lengthText).toString(), 
       seconds: data.lengthInSeconds