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/WatchNextEndScreen.ts

@@ -12,7 +12,7 @@ class WatchNextEndScreen extends YTNode {
 
   constructor(data: any) {
     super();
-    this.results = Parser.parseArray<EndScreenVideo | EndScreenPlaylist>(data.results, [ EndScreenVideo, EndScreenPlaylist ]);
+    this.results = Parser.parseArray(data.results, [ EndScreenVideo, EndScreenPlaylist ]);
     this.title = new Text(data.title).toString();
   }
 }