Fix a lot of naming

.circleci/config.yml

CONTRIBUTING

README.rst

default.nix

docs/source/conf.py

docs/source/index.rst

docs/source/interface.rst

pyproject.toml

secure-access-token-authorizer.nix

setup.cfg

src/_secureaccesstokenauthorizer/_plugin.py

src/_secureaccesstokenauthorizer/_storage_client.py

src/_secureaccesstokenauthorizer/_storage_server.py

src/_secureaccesstokenauthorizer/api.py

src/_secureaccesstokenauthorizer/tests/strategies.py

src/_secureaccesstokenauthorizer/tests/test_base64.py

...secureaccesstokenauthorizer/tests/test_client_resource.py

src/_secureaccesstokenauthorizer/tests/test_matchers.py

src/_secureaccesstokenauthorizer/tests/test_model.py

src/_secureaccesstokenauthorizer/tests/test_plugin.py