Merge pull request #3605 from ProjectMirador/react-full-screen

__tests__/src/actions/workspace.test.js

__tests__/src/components/AppProviders.test.js

__tests__/src/components/FullScreenButton.test.js

package.json

src/components/AppProviders.js

src/components/FullScreenButton.js

src/containers/AppProviders.js

src/containers/FullScreenButton.js

src/contexts/FullScreenContext.js

src/state/actions/workspace.js