Add support for YouTube playlists

Thanks for the request, @arcovia. This has been added and committed. (Note: Since YouTube seems to only support embedding playlists via iframes anymore, the HTML5 player will always be used for this codec.) It will be available in the dev build tonight. Attached is a git patch for those that prefer it.

Oops. Here's a better patch.

...and here's one for d7. :) This will be in the corresponding dev release tonight.

The last patch (#4) is obviously broken. Here is the patch for the current 7.x-3.x-dev:

--- video_filter.codecs.inc.orig        2012-09-19 19:29:19.000000000 +0400
+++ video_filter.codecs.inc     2012-10-11 00:34:50.703442274 +0400
@@ -205,7 +205,7 @@
     'control_bar_height' => 25,
   );
 
-  $codecs['youtube'] = array(
+  $codecs['youtube_playlist'] = array(
     'name' => t('YouTube (Playlist)'),
     'sample_url' => 'http://www.youtube.com/playlist?list=uN1qUeId',
     'callback' => 'video_filter_youtube_playlist_html5',

Oh, it's committed now: http://drupalcode.org/project/video_filter.git/commitdiff/f9212eb

Thank you, @maximpodorov. Somehow I missed your comment in #5, or I would've reported back here sooner!