Integrate serialization plugin into big Kotlin plugin

Split import handlers into multiple files
Add empty Maven handler for Android Studio

Add testRuntime dependency on kx-serialization-plugin for all modules which require compiler
plugins in test classpath

libraries/tools/kotlin-serialization/src/main/kotlin/org/jetbrains/kotlinx/serialization/gradle/SerializationSubplugin.kt

@@ -18,17 +18,12 @@ package org.jetbrains.kotlinx.serialization.gradle
 
 import org.gradle.api.Plugin
 import org.gradle.api.Project
-import org.gradle.api.logging.Logger
-import org.gradle.api.logging.Logging
-import org.gradle.api.tasks.SourceSet
 import org.gradle.api.tasks.compile.AbstractCompile
 import org.jetbrains.kotlin.gradle.plugin.KotlinCompilation
 import org.jetbrains.kotlin.gradle.plugin.KotlinGradleSubplugin
 import org.jetbrains.kotlin.gradle.plugin.SubpluginArtifact
 import org.jetbrains.kotlin.gradle.plugin.SubpluginOption
 import org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile
-import java.io.FileNotFoundException
-import java.util.*
 
 class SerializationGradleSubplugin : Plugin<Project> {
     companion object {
@@ -42,13 +37,11 @@ class SerializationGradleSubplugin : Plugin<Project> {
 
 class SerializationKotlinGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> {
     companion object {
-        const val SERIALIZATION_GROUP_NAME = "org.jetbrains.kotlinx"
+        const val SERIALIZATION_GROUP_NAME = "org.jetbrains.kotlin"
         const val SERIALIZATION_ARTIFACT_NAME = "kotlinx-gradle-serialization-plugin"
         const val SERIALIZATION_ARTIFACT_UNSHADED_NAME = "kotlinx-gradle-serialization-plugin-unshaded"
     }
 
-    private val log = Logging.getLogger(this.javaClass)
-    private val pluginVersion = "0.7.0-eap-1"
     private var useUnshaded = false
 
     override fun isApplicable(project: Project, task: AbstractCompile): Boolean {
@@ -65,36 +58,15 @@ class SerializationKotlinGradleSubplugin : KotlinGradleSubplugin<AbstractCompile
         variantData: Any?,
         androidProjectHandler: Any?,
         kotlinCompilation: KotlinCompilation?
-    )
-            : List<SubpluginOption> {
+    ): List<SubpluginOption> {
         return emptyList()
     }
 
 
     override fun getPluginArtifact(): SubpluginArtifact {
         val artifact = if (useUnshaded) SERIALIZATION_ARTIFACT_UNSHADED_NAME else SERIALIZATION_ARTIFACT_NAME
-        return SubpluginArtifact(SERIALIZATION_GROUP_NAME, artifact, pluginVersion)
+        return SubpluginArtifact(SERIALIZATION_GROUP_NAME, artifact)
     }
 
     override fun getCompilerPluginId() = "org.jetbrains.kotlinx.serialization"
 }
-
-// taken from KotlinPluginWrapper.kt
-internal fun Logger.kotlinDebug(message: String) {
-    this.debug("[KOTLIN] $message")
-}
-
-private fun Any.findPluginVersion(log: Logger): String {
-    log.kotlinDebug("Loading version information about kotlinx.serialization")
-    val props = Properties()
-    val propFileName = "plugin.properties"
-    val loader = javaClass.classLoader!!
-    val inputStream = loader.getResourceAsStream(propFileName)
-            ?: throw FileNotFoundException("property file '$propFileName' not found in the classpath")
-
-    props.load(inputStream)
-
-    val pluginVersion = props["plugin.version"] as String
-    log.kotlinDebug("Found plugin version [$pluginVersion]")
-    return pluginVersion
-}

libraries/tools/kotlin-serialization/src/main/resources/plugin.properties

@@ -1 +0,0 @@
-plugin.version=${project.version}