Basic native support in kotlin-multiplatform (#1811)

* Add dependency on KN shared in gradle-plugin

* Basic support for Kotlin/Native:
     * Target presets
     * Compilation into a klib
     * Compilation into native binraies: framework and executable
     * Basic dependencies between projects
     * No jars in native publications
     * Replace '-' with '_' in framework names
    * Escape quotes in native command lines on Windows
* Move targets from Kotlin/Native repo
* Download KN compiler using Gradle's mechanisms
* Support source set dependencies in native

libraries/tools/kotlin-gradle-plugin-api/build.gradle

@@ -15,7 +15,8 @@ pill {
 
 dependencies {
     compile project(':kotlin-stdlib')
-    
+    compile project('::konan:konan-utils')
+
     compileOnly gradleApi()
     compileOnly 'com.android.tools.build:gradle:0.4.2'
 }

libraries/tools/kotlin-gradle-plugin-api/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlatformType.kt

@@ -12,8 +12,7 @@ import org.gradle.api.attributes.CompatibilityCheckDetails
 import java.io.Serializable
 
 enum class KotlinPlatformType: Named, Serializable {
-    common, jvm, js, androidJvm,
-    native; // TODO: split native into separate entries here or transform the enum to interface and implement entries in K/N
+    common, jvm, js, androidJvm, native;
 
     override fun toString(): String = name
     override fun getName(): String = name