Migrate to new lit* once it's stable

[hsablonniere]

• Maybe we could move our mixing to controllers
• Maybe we could use some refs
• Try the react wrapper stuff
• Use Lit labs motion (animation)

https://lit.dev/docs/releases/upgrade/

TODO:

• [ ] Test all components
• [ ] _private => state: true
• [ ] HMR
• [ ] should we use willUpdate instead of update? https://lit.dev/docs/components/lifecycle/#reactive-update-cycle-triggering
• [ ] static get properties () { => static properties = {
• [ ] static get styles () { => static styles = {
• [ ] Check the minification system
• [ ] Check eslint-plugin-lit
• [ ] Check web-component-analyzer
• [ ] Remove the shim
• [ ] Check build
• [ ] Check CDN build