SetProtocolInfo: return in priority the non transcoded URL AND same mime type base

[lferrandis]

When searching a matching resource url, we should not return the first that match the supported format, but we should return in priority the non transcoded URL, then any matching url.

We should also ensure to return in priority the same base mime type.
An object could have 2 audio URLs and 2 image URLs (cover). If we don't support the audio, we should not return the cover instead.

[jku]

We might actually want to use the GUPnP-AV API that already does some of this :)

https://developer.gnome.org/gupnp-av/unstable/GUPnPDIDLLiteObject.html#gupnp-didl-lite-object-get-compat-resource

It seems to handle prioritizing non-transcoded resources. It doesn't handle the mimetype/upnp_class comparison but I think we should add the new functionality in gupnp-av and not in dleyna and then modify dleyna to use this function -- unless of course there was some good reason to do it inside dleyna.