Merge 'Add CAA an URI types'

src/libknot/descriptor.c

src/libknot/descriptor.h

src/libknot/rrset-dump.c

src/libknot/rrset-dump.h

src/zscanner/scanner.c.g2

src/zscanner/scanner.c.t0

src/zscanner/scanner.rl

src/zscanner/scanner_body.rl

src/zscanner/tests/TESTS

src/zscanner/tests/data/51_URI.in

src/zscanner/tests/data/51_URI.out

src/zscanner/tests/data/52_CAA.in

src/zscanner/tests/data/52_CAA.out

src/zscanner/tests/unittests.in

tests-extra/data/records.zone

tests/descriptor.c