Add identifiable interface for entities
Move identifiable interface into model component
Updating applicable models to have the identifible interface
Merge branch 'master' into feature/identifiable-interface
Fix namespace on identifiable interface
Merge branch 'feature/identifiable-interface' of github.com:tickit-project/tickit into feature/identifiable-interface
Update managers to use IdentifiableInterface in type hints
Merge pull request #144 from tickit-project/feature/identifiable-type-hints

Feature/identifiable type hints