Unpaired candidates need to be marked as local or remote

[alvestrand]

At the moment, one is supposed to figure out whether a candidate is local or remote based on its position in a candidate pair.

This doesn't cover the case where you have candidates that aren't paired with anything - for instance IPv6 local candidates when talking to an IPv4-only remote system.

There should be an "isRemote = false" field on RTCIceCandidateStats, just like we have on RTCRTPStreamStats.

[alvestrand]

I was wrong. Local candidates have their "type" field set to "local-candidate", while remote candidates have their "type" field set to "remote-candidate", so they're actually distinguishable. Closing issue.