v0.16.0

What's Changed

• Update slinky-readwrite to 0.7.0

• Update sbt to 1.6.1

• Update ujson to 1.4.4

• PropTypes#dyn instead of making PropTypes itself extend Dynamic
  This eliminates Scala 3 needing you to import language.dynamics everywhere

• FacadeGenerator: speed up and cache steps

• Bump react-datepicker to 4.6.0

• scalajs-react 2.0.0, add Scala 3 and drop 2.12

Full Changelog: v0.15.2...v0.16.0