Add RTP packet dissector#30

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onitake wants to merge 10 commits intomainfrom

Commits on Jul 23, 2019

Added RTP packet dissector
onitake
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Commits on Jul 25, 2019

Commits on Jul 30, 2019

Generalised seqQ interface and removed redundant error codes
onitake
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Commits on Jul 31, 2019

Added absolute difference utility
onitake
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