v34

General:

• Better use of out->covered()
• Tests: use automatic offset computation when applicable
• Add uncv, unci sample entries
• list specs and rules as json

AV1-ISOBMFF (new!):

• Add spec with version 1.2.0

AV1 HDR10+:

• Finalize

AVIF:

• Improve some data offset computation

ISOBMFF:

• More tests
• Add co64 support