Add API v1.2 (#661)
Add API v1.2 (#661)

* initial work on v1.2: copying and updating v1.1

* remove artwork_collections_api

* updated changelog, removed add_to_collection and remove_from_collection on python api wrapper

* removed add_to_collection and remove_from_collection on node api wrapper

* removes add_to_collection and remove_from_collection

* refactored collection update on frontend

* added integration test

* security fix: disable adding foreign private artworks

brightforme/python-bright