Merge pull request #3254 from ProjectMirador/auth-refactor

__tests__/src/actions/auth.test.js

__tests__/src/components/App.test.js

__tests__/src/components/AuthenticationLogout.test.js

__tests__/src/components/AuthenticationSender.test.js

__tests__/src/components/IIIFAuthentication.test.js

__tests__/src/components/Window.test.js

__tests__/src/components/WindowAuthenticationBar.test.js

__tests__/src/components/WindowAuthenticationControl.test.js

__tests__/src/reducers/accessTokens.test.js

__tests__/src/reducers/auth.test.js

__tests__/src/reducers/infoResponse.test.js

__tests__/src/sagas/auth.test.js

__tests__/src/sagas/iiif.test.js

__tests__/src/selectors/auth.test.js

__tests__/src/selectors/canvases.test.js

src/components/AccessTokenSender.js

src/components/App.js

src/components/AuthenticationLogout.js

src/components/AuthenticationSender.js

src/components/IIIFAuthentication.js