Update Quickstrom tests to last version

[marcosh]

the quickstrom branch contains a test suite created using the old version of https://quickstrom.io/. Update it to the last version of the specification language

[cgeorgii]

I currently have a problem running the test suite in the quickstrom branch. Perhaps we could take a look at it together before addressing this?

[cgeorgii]

After investigation, we decided to start a new branch for the latest version of Quickstrom, since it's considerably different from the current implementation.