xspf_playlist 5.x-1.20-beta3

Changes since DRUPAL-5--1-20-BETA2:

• fixes a regression error with the thumbnail data structure
• fixes a problem with i18n urls and file paths
• fixes an issue where a playlist item does not have a type that can be generated from the URL which prevents the player from playing
• * fixes missing content types on the admin settings form
  * harmonizes form settings between d5 and d6
  * relocates thumb functions to the thumbnail module
  * improvements in file extension vs. mime type handling
• fixes an issue with a missing function