[- ts/serve] remove serve module placeholder
[test/d/*-exif.json] fix exif test literal values
[tst/d/ts/B/.tsm] fill good ts' manifest
[tst/h.py] add new test data to helpers.py
[util.imgmeta] fix most failing tests in imgmeta
[ts.util] add unicode->str dict converter & consts
[ts.parse] add start of parser, and tests
[ts.util.validation] add validation helpers
[ts.parse.validate] add ts manifest validator