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/AccountItemSection.ts

@@ -39,7 +39,7 @@ class AccountItemSection extends YTNode {
   constructor(data: RawNode) {
     super();
     this.contents = data.contents.map((ac: any) => new AccountItem(ac.accountItem));
-    this.header = Parser.parseItem<AccountItemSectionHeader>(data.header, AccountItemSectionHeader);
+    this.header = Parser.parseItem(data.header, AccountItemSectionHeader);
   }
 }