Add WeDo device connection steps

src/components/connection-modal/auto-scanning-step.jsx

src/components/connection-modal/connection-modal.css

src/components/connection-modal/connection-modal.jsx

src/components/connection-modal/icons/searching.png

src/containers/auto-scanning-step.jsx

src/containers/blocks.jsx

src/containers/connection-modal.jsx

...sions/device-connection/wedo/wedo-button-illustration.svg

...s/extensions/device-connection/wedo/wedo-illustration.svg

...ibraries/extensions/device-connection/wedo/wedo-small.svg

src/lib/libraries/extensions/index.jsx