KT-39788 MPP, Gradle runner: Run does not add resource directory to classpath // classpath fix

The reason of resource directory absence was that it couldn't be loaded
from the project configuration file. Just after the import it remained
in the memory and runner couldn' get it. KotlinOutputPathsDataService as
a pair to KotlinOutputPaths is what was missing. Details are provided
below.
------------------------------------------------------------------------
On a disk configuration represents a binary file containing serialized
graph of external project structure. It contains nodes belonging to both
IDEA and its plugins.

To deserialize a node IDEA tries to load its class using a chain of
class-loaders: its own and those provided by actual set of plugins.
The nuance is how to get plugins' ones. The approach is the following.
There is an association between a node's payload and a service which is
supposed to consume it see KotlinOutputPathsDataService#getTargetDataKey
and DataNode#getKey). Plugin services are guaranteed to be loaded by
plugin class loader.
No association - service - no plugin, node was just skipped.
------------------------------------------------------------------------

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinMPPDataNodes.kt

@@ -70,7 +70,8 @@ class KotlinTargetData @PropertyMapping("externalName") constructor(externalName
     }
 }
 
-class KotlinOutputPathsData(val paths: MultiMap<ExternalSystemSourceType, String>) : AbstractExternalEntityData(GradleConstants.SYSTEM_ID) {
+class KotlinOutputPathsData @PropertyMapping("paths") constructor(val paths: MultiMap<ExternalSystemSourceType, String>) :
+    AbstractExternalEntityData(GradleConstants.SYSTEM_ID) {
     companion object {
         val KEY = ExternalKey.create(KotlinOutputPathsData::class.java, ProjectKeys.CONTENT_ROOT.processingWeight + 1)
     }

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinOutputPathsDataService.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.configuration
+
+import com.intellij.openapi.externalSystem.model.DataNode
+import com.intellij.openapi.externalSystem.model.project.ProjectData
+import com.intellij.openapi.externalSystem.service.project.IdeModifiableModelsProvider
+import com.intellij.openapi.externalSystem.service.project.manage.AbstractProjectDataService
+import com.intellij.openapi.project.Project
+
+/**
+ * This service appeared as a solution of the problem when [KotlinOutputPathsData] couldn't be deserialized after having been stored on disk
+ * as a part of [DataNode] graph. Though we don't need the service itself, for now its the only way to make things work.
+ *
+ * Deserialization takes place at [serialization.kt#createDataClassResolver] (located in [platform-api.jar]).
+ *
+ * Graph contains nodes belonging to both IDEA and its plugins. To deserialize a node IDEA tries to load its class using a chain of
+ * class-loaders: its own and those provided by actual set of plugins. The nuance is how to get plugins' ones. The approach is the
+ * following. There is an association between a node's payload and a service which is supposed to consume it, see [getTargetDataKey] and
+ * [DataNode.key]. Plugin services are guaranteed to be loaded by plugin class loader. No service - no plugin, node is just skipped.
+ *
+ */
+class KotlinOutputPathsDataService : AbstractProjectDataService<KotlinOutputPathsData, Void>() {
+    override fun getTargetDataKey() = KotlinOutputPathsData.KEY
+
+    override fun importData(
+        toImport: MutableCollection<DataNode<KotlinOutputPathsData>>, projectData: ProjectData?, project: Project,
+        modelsProvider: IdeModifiableModelsProvider
+    ) {
+    }
+}

idea/resources/META-INF/gradle-java.xml

@@ -25,6 +25,7 @@
         <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinGradleProjectDataService"/>
         <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinGradleLibraryDataService"/>
         <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinTargetDataService"/>
+        <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinOutputPathsDataService"/>
         <externalProjectDataService implementation="org.jetbrains.kotlin.idea.KotlinJavaMPPSourceSetDataService"/>
         <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.klib.KotlinNativeLibraryDataService"/>
         <externalSystemTaskNotificationListener

idea/resources/META-INF/gradle-java.xml.193

@@ -29,6 +29,7 @@
     <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinGradleProjectDataService"/>
     <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinGradleLibraryDataService"/>
     <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinTargetDataService"/>
+    <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.KotlinOutputPathsDataService"/>
     <externalProjectDataService implementation="org.jetbrains.kotlin.idea.KotlinJavaMPPSourceSetDataService"/>
     <externalProjectDataService implementation="org.jetbrains.kotlin.idea.configuration.klib.KotlinNativeLibraryDataService"/>
     <externalSystemTaskNotificationListener