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

exceptions/ExtractionException.java

@@ -1,6 +1,6 @@
 package org.schabi.newpipe.extractor.exceptions;
 
-/**
+/*
  * Created by Christian Schabesberger on 30.01.16.
  *
  * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
@@ -24,9 +24,11 @@ public class ExtractionException extends Exception {
     public ExtractionException(String message) {
         super(message);
     }
+
     public ExtractionException(Throwable cause) {
         super(cause);
     }
+
     public ExtractionException(String message, Throwable cause) {
         super(message, cause);
     }

exceptions/FoundAdException.java

@@ -1,6 +1,6 @@
 package org.schabi.newpipe.extractor.exceptions;
 
-/**
+/*
  * Created by Christian Schabesberger on 12.09.16.
  *
  * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
@@ -24,6 +24,7 @@ public class FoundAdException extends ParsingException {
     public FoundAdException(String message) {
         super(message);
     }
+
     public FoundAdException(String message, Throwable cause) {
         super(message, cause);
     }

exceptions/ParsingException.java

@@ -1,6 +1,6 @@
 package org.schabi.newpipe.extractor.exceptions;
 
-/**
+/*
  * Created by Christian Schabesberger on 31.01.16.
  *
  * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
@@ -25,6 +25,7 @@ public class ParsingException extends ExtractionException {
     public ParsingException(String message) {
         super(message);
     }
+
     public ParsingException(String message, Throwable cause) {
         super(message, cause);
     }

exceptions/ReCaptchaException.java

@@ -1,6 +1,6 @@
 package org.schabi.newpipe.extractor.exceptions;
 
-/**
+/*
  * Created by beneth <bmauduit@beneth.fr> on 07.12.16.
  *
  * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>