Merge pull request #1756 from ProjectMirador/1750-window-menu-button

__tests__/integration/mirador/index.html

__tests__/src/actions/window.test.js

__tests__/src/components/ThumbnailNavigation.test.js

__tests__/src/components/WindowThumbnailSettings.test.js

__tests__/src/components/WindowTopMenu.test.js

__tests__/src/components/WindowTopMenuButton.test.js

__tests__/src/lib/MiradorViewer.test.js

__tests__/src/reducers/windows.test.js

src/components/ThumbnailNavigation.js

src/components/WindowThumbnailSettings.js

src/components/WindowTopBar.js

src/components/WindowTopMenu.js

src/components/WindowTopMenuButton.js

src/config/settings.js

src/containers/WindowThumbnailSettings.js

src/containers/WindowTopMenu.js

src/lib/MiradorViewer.js

src/state/actions/action-types.js

src/state/actions/window.js

src/state/reducers/windows.js