Refactor extractor

- Refactor info classes and extractors
- Reformat and fix indentation
- Organize packages and classes
- Rename variables/methods and fix regex
- Change the capitalization
- Add methods to playlist extractor

ServiceList.java

@@ -2,7 +2,7 @@ package org.schabi.newpipe.extractor;
 
 import org.schabi.newpipe.extractor.services.youtube.YoutubeService;
 
-/**
+/*
  * Created by the-scrabi on 18.02.17.
  */