Make HTTP Metrics more spec compliant
Created by: davemevans
Recently I have been looking a Metrics Reporting and noticed that there were a few disparities between the DASH spec and the client implementation, notably redirect reporting and HTTP trace reporting and a few other things as well.
I have also enabled viewing of stream-related (manifest loading, xlink resolving) metrics in the sample player, as well as viewing traces for all metrics types.
The same fix as requested in #597 is in here which I had already spotted.