Simplify registration proccess

[Ramarti]

• Continuing the simplification of licensing, there is no need for the concept of PolicyFramework as a data struct in LicenseRegistry, so we just use the framework address for ID and we move the related data to the PolicyFrameworkManager contract
• Improving method naming for policy related operations in LicenseRegistry.
  -- addPolicy() is renamed registerPolicy() since it's the one well, registering data into LicenseRegistry
  -- Since we have PolicyFrameworkManager now, there is no need to pass Policy struct, just bytes data and LicenseRegistry will create the Policy object with the sender (the manager).
• Removing unecesary and expensive event in UMLPolicyFrameworkManager