I came across the mediaUrl in notifications to display an image instead of an icon. My question is: Why does this feature not exist for private notifications? I modified the MPWS to have the mediaUrl set, too. And Maniaplanet kind of changes to the image-mode of the notification, yet it fails to actually show the image (it seems that the URL does not get rendered into the <quad>). I assume it currently is only supported for public and personal notifications, but why not for private ones? ^^
Same goes for the grouping feature: That one is also missing on private notifications

(I also came across some small errors in the code, for which i created a pull request
