refactor(Parser)!: general refactoring of parsers (#344)

* refactor: move common info into MediaInfo

* refactor: better inference on Memo

* refactor: improved typesafety in parser methods

* refactor: remove PlaylistAuthor in favor of Author

* refactor: cleanup live chat parsers

- Replace non standard author type with Author class
- Remove redundant code

* fix: new errors due to changes

* fix: pass actions to FormatUtils#toDash

* refactor!: merge NavigatableText and Text into single class

src/parser/classes/MusicShelf.ts

@@ -37,7 +37,7 @@ class MusicShelf extends YTNode {
     }
 
     if (data.bottomButton) {
-      this.bottom_button = Parser.parseItem<Button>(data.bottomButton);
+      this.bottom_button = Parser.parseItem(data.bottomButton, Button);
     }
 
     if (data.subheaders) {