Kotlin Multiplatform Gradle project layout support

[axelfontaine]

When using the Kotlin Multiplatform Gradle plugin, the directory layout is slightly different. I had to use the following config to make things work:

val config = AnalyzerConfig.gradle(Language.KOTLIN).main()
        .withSources(File("src/jvmMain/kotlin"))
        .withClasses(File("build/classes/kotlin/jvm/main"))

This could probably be added as a preset, in addition to the one from the regular Kotlin/JVM plugin.