Upgrading to Node-RED 2.0

[louislefevre]

Enhancement Description

Node-RED 2.0 was released in July 2021, as described here. Given that this is the next major version of Node-RED, we should eventually consider ensuring that our node library is compatible and makes use of any new features we might find useful.

Perhaps we could test this soon and we might get lucky and everything works just fine immediately. However, if that isn't the case and any required fixes aren't trivial to implement, I'd probably leave this for future development and not deal with this any time soon.

It's worth noting that the minimum required version of Node.js would increase to Node.js 12.17.x, as Node-RED 2.0 requires that version at a minimum.

[louislefevre]

Tested this locally, passes all tests and nothing seems to break.