Split media also with colon

Split the media path with the colon namespace separator. This is needed
when rewrite is not active. This is only a quick hack, we need
definitely a better solution to prepare media links and catch them.
Add support for skins

Code for displaying skin with the {{skin>Player}} syntax was already
there but not really functional.
Now the skin syntax displays a front view of the full player (from head
to legs).