Integration Test

Adopt EncodedOutput from protocol. Document Image Output in README #617

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Run time

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Job	Run time
build	5m 58s
test (room)	5m 43s
test (web)	2m 53s
test (participant)	5m 35s
test (track_composite)	6m 6s
test (track)	3m 31s
	29m 46s