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

app/streaming/video/overlaymanager.h

@@ -46,7 +46,7 @@ private:
         bool enabled;
         int fontSize;
         SDL_Color color;
-        char text[512];
+        char text[1024];
 
         TTF_Font* font;
         SDL_Surface* surface;