Merge pull request #2827 from ProjectMirador/workspace-config-state

__tests__/src/actions/workspace.test.js

__tests__/src/components/WorkspaceSelectionDialog.test.js

__tests__/src/reducers/workspace.test.js

__tests__/src/selectors/config.test.js

__tests__/src/selectors/windows.test.js

__tests__/src/selectors/workspace.test.js

src/components/WorkspaceSelectionDialog.js

src/config/settings.js

src/containers/WorkspaceSelectionDialog.js

src/state/actions/action-types.js

src/state/actions/workspace.js

src/state/reducers/workspace.js

src/state/selectors/config.js

src/state/selectors/windows.js

src/state/selectors/workspace.js