* fix php tests
* fix scala tests
* update ts angular v6 rest
* fix user create test
* fix spring cloud test
* comment out user delete
* fix angular v7 tests
* fix user test
* fix tests
* fix go exp tests
* commented out delete user tests
* comment out delete user tests in go openapi 3
* fix clojure tests
* [go-experimental] export required fields without pointer, only omitempty if type is not required and not nullable
* fix: go-experimental sample code
* fix: export nullable field as pointer
* update samples
* feat: nullable types
* add getter/setter for required fields, improve docstring
* [Go][experimental-client] Properly define packageName for go-experimental sample client
* [Go][experimental-client] make structure members pointers, provide custom marshalling.