Added QML debugging code

I found out it is possible to remotely debug QML with Qt creator
The youtube plugin is now more reliable

Now works with already shorten links
links with weird query string now work too
If the link reffers to a playlist, it is unchanged, the user is warned
in the tray and can shorten it anyway by clicking the tray message
Improved Imgur plug-in

Now sort the images correctly by date in descending order.
Displays a correct message for image deletion
Now uses a cleaner way to fetch thumbnail