Django REST Framework 3.10 and custom schema generation

• Bump to DRF 3.10.3
• No more arkindex/openapi images
• Adds pagination in OpenAPI
• Better support of UUIDs, URIs, Django validators and default values
• deprecated = True available on API views to get them marked as deprecated
• Millenials are killing the patch.yml industry: openapi_overrides = {} to override properties on the view's corresponding Operation Object (operationId, description, tags, security, …)