improve quickref

[bjornregnell]

• Make the java-part more focused on the JDK.
• Reduce the number of pages in the java part
• Include more Scala 3 constructs, like extension, given-using, etc.
• make a summary of syntax for common constructs (the first page is very cramped, use the space released by reduced space for java to make more room for syntax constructs and examples)
• include scala-cli commands
• include scala toolkit examples
• include parts of introprog-scalalib

[bjornregnell]

see also #418 and #736

https://docs.scala-lang.org/toolkit/introduction.html

https://scala-cli.virtuslab.org/docs/guides/toolkit/

https://users.scala-lang.org/t/scala-toolkit-0-2-0-is-out-discussion/9355

[bjornregnell]

consider add info about scala toolkit also in appendex C or F and on slides, exercises etc

[bjornregnell]

if java-part is revamped and not connected to retired contributors, consider moving quickref to its own repo, perhaps under bjornregnell

[bjornregnell]

consider moving quickref to Scala-source from which latex and markdown can be generated; this may be valuable if quickref is to be contributed to scala-lang, which is based on markdown

[bjornregnell]

add info on ScalaJS and Scala Native. Add a short part on javascript as a runtime, alongside Java/JVM/JDK -> three subparts on each runtime?

[EliasAAradsson]

I believe too that it would be a good idea to separate the Scala and Java quickrefs. However, I don't believe all of this to be necessary:

* Make the java-part more focused on the JDK.
* Reduce the number of pages in the java part
* Include more Scala 3 constructs, like extension, given-using, etc.
* make a summary of syntax for common constructs (the first page is very cramped, use the space released by reduced space for java to make more room for syntax constructs and examples)
* include scala-cli commands
* include scala toolkit examples
* include parts of introprog-scalalib

The way I see it, the primary function of the quickref is to be a substitute for proper documentation of Scala and it's standard library, to be use when access to proper documentation is limited or unnecessary, first and foremost in a pen and paper exam situation.