renderer,renderer-gst: Get profiles from renderer

Let the renderer return a list of supported DLNA profiles.

To not break ABI/API we duplicate DLNAProfiles from server; needs to be moved
to core in next unstable cycle.

https://bugzilla.gnome.org/show_bug.cgi?id=699698
data: Add X_DLNADOC node to device description

https://bugzilla.gnome.org/show_bug.cgi?id=706142
data: Remove unused state variables

https://bugzilla.gnome.org/show_bug.cgi?id=706143