* interceptor: add MediaStream feed debug interceptor
- interceptor displays nick name for default and nick name + user id if user gast
- interceptor displays track id + media stream ids
This is an Element project (in the vector-im repo) so the Copyright
should be for New Vector: it was incorrectly attributed to the
foundation for some files (and some files were missing headers).
We were putting the whole array from setState in, so the debug info
was wrapped in an array when it shouldn't be.
Also comment the groupCallInspector setState/context dance which I
now *finally* understand.
