Iotics-identity

This release upgrades the package dependencies to the latest versions and drops support for Python 3.7.

* New Delegation Proof Type {DID, GENERIC}
* New API Proof objects: APIProof, APIDidDelegationProof, APIGenericDelegationProof used in advanced api
(decouple api from crypto proof, deal with deleagtion proof type and content, backward compatible)
* New Advanced API helpers to create generic proof and allow delegation with generic proof
* New validation mode according to the proof type
* New Regisered document delegation proof type serialization

Make delegation_name parameter optional in high_level and regular APIs. If the parameter is omitted a random name will be chosen.

Iotics DID Spec python implementation


* High level identity API/profile: a minimal set of features to interact with Iotics Host.
* Identity API/profile: set of features for identities management.
* Advanced identity API/profile: set of features for advanced identities management.