Move Video class to a separate library

+ improve error handling
+ youtube-dl update

classes/exceptions/ConfigException.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Alltube\Exception;
+
+use Exception;
+
+class ConfigException extends Exception
+{
+
+}

classes/exceptions/EmptyUrlException.php

@@ -1,16 +0,0 @@
-<?php
-
-/**
- * EmptyUrlException class.
- */
-
-namespace Alltube\Exception;
-
-use Exception;
-
-/**
- * Exception thrown when youtube-dl returns an empty URL.
- */
-class EmptyUrlException extends Exception
-{
-}

classes/exceptions/PasswordException.php

@@ -1,16 +0,0 @@
-<?php
-
-/**
- * PasswordException class.
- */
-
-namespace Alltube\Exception;
-
-use Exception;
-
-/**
- * Exception thrown when a video requires a password.
- */
-class PasswordException extends Exception
-{
-}