Fix RTP timestamp parsing#119
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Add several robustness fixes to the RTSP demuxer and client and introduce unit tests. - Add mergeResponseHeader to preserve Digest over Basic in WWW-Authenticate responses (prefer strongest scheme) to avoid downgrading to Basic (backports upstream PR deepch#104) and use it when parsing response headers. - Use RFC 7826 default ports: 322 for rtsps and 554 for rtsp (backports upstream PR deepch#118) when parsing URLs; normalize unknown schemes to rtsp. Add URL parsing tests. - Fix RTP timestamp slice to read exactly 4 bytes (avoid leaking SSRC into timestamp) (backports upstream PR deepch#119) and add tests verifying timestamp behavior. - Harden H.264 STAP-A parsing to guard against size==0 causing OOB reads (prevents panics, referenced upstream issue deepch#114). - Add bounds checks in AAC handling to avoid panics from malformed AU headers and frame sizes (backports upstream PR deepch#126). - Add comprehensive tests: client_test.go and demuxer_test.go covering URL parsing, WWW-Authenticate merging, H.264 STAP-A, AAC malformed packets, metadata reassembly, and other demuxer behaviors. Remove older demuxer_metadata_test.go in favor of unified tests.
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Correctly read 4-byte timestamp from RTP header (positions 8-11) instead of erroneous 8-byte read. Ensures RFC 3550 compliance.