[isabelle-dev] NEWS: Isabelle/Scala is now based on Scala 3

[Makarius]

*** System ***

* Isabelle/Scala is now based on Scala 3. This is a completely different
compiler ("dotty") and a quite different source language (we are using
the classic Java-style syntax, not the new Python-style syntax).
Occasional INCOMPATIBILITY, see also the official Scala documentation
https://docs.scala-lang.org/scala3/guides/migration/compatibility-intro.html


This refers to Isabelle/21164fd15e3d.

The change looks unexciting, but behind it are many weeks / months of 
disentangling assumptions about the Scala environment.

Now everything should be clear, and hopefully there are no remaining surprises.


	Makarius