Delete Kotlin IntelliJ IDEA plugin sources

Kotlin plugin sources were migrated to intellij-community:
https://github.com/JetBrains/intellij-community/tree/master/plugins/kotlin

Preserve `jps-plugin/testData/incremental`
because it's used in `compiler/incremental-compilation-impl/test`

Preserve `idea/testData/multiModuleHighlighting/multiplatform`
because it's used in `MppHighlightingTestDataWithGradleIT`

plugins/scripting/scripting-idea/build.gradle.kts

@@ -1,23 +0,0 @@
-
-description = "Kotlin Scripting IDEA Plugin"
-
-plugins {
-    kotlin("jvm")
-    id("jps-compatible")
-}
-
-dependencies {
-    compile(project(":kotlin-scripting-intellij"))
-    compileOnly(project(":idea:idea-gradle"))
-    compileOnly(project(":idea:idea-core"))
-    compileOnly(intellijDep())
-    compileOnly(intellijDep("gradle"))
-}
-
-sourceSets {
-    "main" { projectDefault() }
-    "test" {}
-}
-
-runtimeJar()
-

plugins/scripting/scripting-idea/src/org/jetbrains/kotlin/scripting/idea/plugin/ScriptingGradleProjectImportHandler.kt

@@ -1,76 +0,0 @@
-/*
- * 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.scripting.idea.plugin
-
-import org.jetbrains.kotlin.cli.common.arguments.CommonCompilerArguments
-import org.jetbrains.kotlin.idea.configuration.GradleProjectImportHandler
-import org.jetbrains.kotlin.idea.facet.KotlinFacet
-import org.jetbrains.kotlin.scripting.KOTLIN_SCRIPTING_PLUGIN_ID
-import org.jetbrains.plugins.gradle.model.data.GradleSourceSetData
-import java.io.File
-
-class ScriptingGradleProjectImportHandler : GradleProjectImportHandler {
-
-    val compilerPluginId = KOTLIN_SCRIPTING_PLUGIN_ID
-    val gradlePluginJars = listOf(
-        "scripting-gradle", // obsolete artifact name, only for compatibility with 1.2.5x, where it was introduced (and immediately dropped afterwards)
-        "scripting-compiler",
-        "scripting-compiler-embeddable"
-    )
-
-    override fun importBySourceSet(
-        facet: KotlinFacet,
-        sourceSetNode: com.intellij.openapi.externalSystem.model.DataNode<GradleSourceSetData>
-    ) {
-        modifyCompilerArgumentsForPlugin(facet, compilerPluginId, gradlePluginJars)
-    }
-
-    override fun importByModule(
-        facet: KotlinFacet,
-        moduleNode: com.intellij.openapi.externalSystem.model.DataNode<com.intellij.openapi.externalSystem.model.project.ModuleData>
-    ) {
-        modifyCompilerArgumentsForPlugin(facet, compilerPluginId, gradlePluginJars)
-    }
-}
-
-// NOTE: partially copied from idePluginUtil.kt, it is not possible to reuse it right now without refactoring
-internal fun modifyCompilerArgumentsForPlugin(
-    facet: KotlinFacet,
-    compilerPluginId: String,
-    pluginJarNames: List<String>
-) {
-    val facetSettings = facet.configuration.settings
-
-    // investigate why copyBean() sometimes throws exceptions
-    val commonArguments = facetSettings.compilerArguments ?: CommonCompilerArguments.DummyImpl()
-
-    // TODO: find out where new options should come from (or maybe they are not needed here at all)
-//    val newOptionsForPlugin = setup?.options?.map { "plugin:$compilerPluginId:${it.key}=${it.value}" } ?: emptyList()
-
-    val oldAllPluginOptions = (commonArguments.pluginOptions ?: emptyArray()).filterTo(mutableListOf()) { !it.startsWith("plugin:$compilerPluginId:") }
-    val newAllPluginOptions = oldAllPluginOptions // + newOptionsForPlugin
-
-    val filterRegexes = pluginJarNames.map {
-        "(kotlin-)?(maven-)?$it-.*\\.jar".toRegex()
-    }
-    val oldPluginClasspaths = (commonArguments.pluginClasspaths ?: emptyArray()).filterTo(mutableListOf()) {
-        val lastIndexOfFile = it.lastIndexOfAny(charArrayOf('/', File.separatorChar))
-        if (lastIndexOfFile < 0) {
-            return@filterTo true
-        }
-        !it.drop(lastIndexOfFile + 1).let { fileName ->
-            filterRegexes.any { fileName.matches(it) }
-        }
-    }
-
-    // TODO: find out how to make it - see comment to the newOptionsForPlugin above
-    val newPluginClasspaths = oldPluginClasspaths // + (setup?.classpath ?: emptyList())
-
-    commonArguments.pluginOptions = newAllPluginOptions.toTypedArray()
-    commonArguments.pluginClasspaths = newPluginClasspaths.toTypedArray()
-
-    facetSettings.compilerArguments = commonArguments
-}