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/ChannelAgeGate.ts

@@ -22,7 +22,7 @@ class ChannelAgeGate extends YTNode {
     this.avatar = Thumbnail.fromResponse(data.avatar);
     this.header = new Text(data.header);
     this.main_text = new Text(data.mainText);
-    this.sign_in_button = Parser.parseItem<Button>(data.signInButton, Button);
+    this.sign_in_button = Parser.parseItem(data.signInButton, Button);
     this.secondary_text = new Text(data.secondaryText);
   }
 }