Remove deprecated API calls

[OlliKiljunen]

Most urgently:

1 compatibility problem

A+ Courses 3.15 is binary incompatible with IntelliJ IDEA Ultimate IU-233.11799.30 due to the following problem

• Method not found (1 problem)
  • Invocation of unresolved constructor ScalaLibraryPropertiesState.<init>(...) (1 problem)
    • Method ScalaSdk.getPropertiesState(...) contains an invokespecial instruction referencing an unresolved constructor ScalaLibraryPropertiesState.<init>(...). This can lead to NoSuchMethodError exception at runtime.

Also, 13 deprecated API usages that are not so urgent but, ideally, should be fixed in this issue unless they'll be fixed already with #1067 (many of them are related to the old tutorial framework).