Add Minimum Viable License Registry

[Ramarti]

First PR for the Licensing Module.

Licensing has been profoundly refactored from alpha from first principles, with the vision that:

• Licensing is access control to add IP into the IP graph
• If data structures express the licensing lifecycle well enough and future/generic functionality is properly decoupled through IParameterVerifier and a future metadata resolver, the LicenseRegistry may be enough and we don't need a LicenseModule
• SP will support licensing Frameworks, with an array of Parameters (terms) for different moments of the licensing life cycle
• A particular configuration (values) for Parameters in a Framework is a Policy.
• IP nodes can define multiple policies, so children IP nodes can be added into the IP graph.
• A License is a tradeable permission to link a child IP node with parent(s), if the conditions of a particular policy are true.
• Adding an IP Node into the IP Graph will link the two and copy the license policy of the parent into the child.
• IP nodes might set new policies, if they are compatible with their already assigned policies.
• Child IP nodes might have multiple parents (licensors), and they will need their licenses to link them.
• Licenses might have multiple licensors (future parents), expressing that under the conditions of the policy, a derivative could come from multiple parents. Meaning that an agreement between the licensors expressed in that license simplifies the process of linking, since the child doesn't need to obtain a (compatible) license per parent.

This PR focuses on minimum viable LicenseRegistry to be connected with the rest of the protocols
Out of scope for this PR:

• Most auth and security checks
• Actually triggering and verifying parameters
• Interface abstraction
• Policy and parameter compatibility checks

[kingster-will]

LGTM!

[kingster-will]

Framework id start from 1, sounds right?

[Ramarti]

Yes, since Solidity doesn't have a null value, it's very useful to reserve 0 to "not set", makes the code safer IMO (easier checks)

[leeren]

lgtm