Kapt3: Extract annotation processing to its own task in Gradle. Now the kotlinCompile task should know nothing about kapt, for the main task it's just a regular Java source root.

libraries/examples/kotlin-gradle-subplugin-example/src/main/kotlin/example/ExampleSubplugin.kt

@@ -39,7 +39,7 @@ class ExampleSubplugin : KotlinGradleSubplugin<AbstractCompile> {
         return listOf(SubpluginOption("exampleKey", "exampleValue"))
     }
 
-    override fun getPluginName(): String {
+    override fun getCompilerPluginId(): String {
         return "example.plugin"
     }