Propagate scalac plugin to IntelliJ module

[phiSgr]

It does not seem that information on scalac plugin used is propagated to IntelliJ. (I'm not experienced with the plugin code to say for sure.)

Without that information, IntelliJ refuses to index and syntax highlight the parts where implicit0 is used.

https://github.com/JetBrains/intellij-scala/blob/737b89c49ecff68afb92e11c3742a2d7bfd5171a/scala/scala-impl/src/org/jetbrains/plugins/scala/project/ScalaModuleSettings.scala#L70