Allow tagging/labeling of tonies/tag and introduce grouping in overview

[henryk86]

Currently (and more when adding images to custom tags is easily possible) you can not distinct between tonies and custom tags (beside the small no cloud icon).

Maybe it is possible to introduce labels (Original Tonie, Creative Tonie, Custom Tag, Custom Tonie (original tonie with other custom content), webradio, …) like here bug, enhancement,… and then add a grouping feature, so that you can group the tonies in the web gui.