ingo kegel <> in Gradle

Added cross-version test for IdeaModule#getJdkName

Tooling API: Support jdkName from idea module model

The information specified by

idea {

module {

jdkName = "My JDK"



is not made available by the tooling API. In order to fix

this change is required first. The language level is already handled automatically in recent versions of IDEA. However, if modules have different language levels, the project JDK is not suitable for them and you have to be able to set a module-specific JDK.