Merge pull request #2000 from ProjectMirador/1978-thumbnail-canvas-nav

__tests__/src/components/CanvasThumbnail.test.js

__tests__/src/components/ThumbnailNavigation.test.js

__tests__/src/components/WindowSideBarCanvasPanel.test.js

__tests__/src/lib/ManifestoCanvas.test.js

src/components/CanvasThumbnail.js

src/components/ThumbnailNavigation.js

src/components/ValidationCanvas.js

src/components/WindowSideBarCanvasPanel.js

src/components/index.js

src/config/settings.js

src/containers/WindowSideBarCanvasPanel.js

src/lib/ManifestoCanvas.js