Convert all time-based stats to be microsecond-based, improving accuracy of very fast events. Add bitrate average/peak.

app/streaming/video/ffmpeg.h

@@ -4,6 +4,7 @@
 #include <QQueue>
 #include <set>
 
+#include "../bandwidth.h"
 #include "decoder.h"
 #include "ffmpeg-renderers/renderer.h"
 #include "ffmpeg-renderers/pacer/pacer.h"
@@ -99,6 +100,7 @@ private:
     IFFmpegRenderer* m_FrontendRenderer;
     int m_ConsecutiveFailedDecodes;
     Pacer* m_Pacer;
+    BandwidthTracker m_BwTracker;
     VIDEO_STATS m_ActiveWndVideoStats;
     VIDEO_STATS m_LastWndVideoStats;
     VIDEO_STATS m_GlobalVideoStats;