RtpSource can now distinguish between payload types and handles some properly.
Fixed bug in mpeg4 depacketizer and RTCP implementation.
The last packet of a fragmented mpeg4 frame is no longer rejected.
H264 SPS and PPS frames are now handled correctly
Adds support more H264 NAL types and tidies function
Save a couple of cpu cycles.
Adds support for h264 cameras that fail to set m bit for end of fragmented frames.
Merge pull request #259 from ebarnard/rtsp-fix

Regression:  Fix RTSP decoding errors in 1.26.4 fixes #221