Implement predictive RFI to recover more quickly from frame loss

With predictive RFI, we can recover from a lost frame as soon as the next frame
by predicting whether we will have enough FEC data to be be able to recover a
frame based on the sequence numbers of the received packets.

src/Limelight-internal.h

@@ -97,6 +97,7 @@ void destroyVideoDepacketizer(void);
 void queueRtpPacket(PRTPV_QUEUE_ENTRY queueEntry);
 void stopVideoDepacketizer(void);
 void requestDecoderRefresh(void);
+void notifyFrameLost(int frameNumber);
 
 void initializeVideoStream(void);
 void destroyVideoStream(void);