feat: remembers group collapse state

babel.config.js

package.json

src/components/Button.js

src/components/CollapsibleSectionHeader.js

src/components/CollapsibleSectionHeader.module.css

src/components/ProxyGroup.js

src/components/ProxyProvider.js

src/components/StateProvider.js

src/misc/utils.js

src/store/app.js

src/store/index.js

yarn.lock