Improve tooling model + add Gradle version checking (#1602)

* [gradle-plugin] Add tests for IDE model
* [gradle-plugin] Check Gradle version
* [gradle-plugin] Provide language, api and konan version in the model
* [gradle-plugin] Use String instead of KonanTarget in the IDE model
* [gradle-plugin] Rename Produce -> KonanOutput
* [version] Make KonanVersion an interface to allow passing it to IDE
* [gradle-plugin] Replace KonanOutput with CompilerOutputKind
* [gradle-plugin] Don't override usual jar with a fat one
* [gradle-plugin] Fix IDE model tests
* [gradle-plugin] Add library search paths in IDE model
* [gradle-plugin] Use 4.7 as a required version for the plugin
* [gradle-plugin] "Kotlinfy" the version check

tools/kotlin-native-gradle-plugin/build.gradle

@@ -45,7 +45,7 @@ apply plugin: 'com.jfrog.bintray'
 apply plugin: 'com.github.johnrengelman.shadow'
 
 group = 'org.jetbrains.kotlin'
-version = KonanVersion.CURRENT.gradlePluginVersion
+version = KonanVersion.Companion.CURRENT.toString()
 
 repositories {
     mavenCentral()
@@ -76,11 +76,17 @@ dependencies {
     }
 }
 
+jar {
+    appendix = "no-shared"
+}
+
 shadowJar {
     configurations = [project.configurations.bundleDependencies]
     classifier = null
 }
 
+assemble.dependsOn shadowJar
+
 test {
     systemProperty("kotlin.version", buildKotlinVersion)
     if (project.hasProperty("konan.home")) {