Validation revision

[dr-orlovsky]

This is a carefull revisioning of all the validation workflow, which resulted in:

• simplified validation code
• more documentation on the validation
• removal of unnecessary error types
• addition of new validation criteria (like state transition consistency and non-cyclic history)
• faster validation performance
• support for both tapret and opret commitments in the same witness transaction
• better support for multiple layer1's
• much simplified consignment APIs
• removal of trust assumptions for the consignment provider (like RGB standard library)
• support for consignment implementations which will not store the whole consignment in memory

Depends on https://github.com/BP-WG/bp-core/pull/69 and https://github.com/RGB-WG/rgb-core/pull/195