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

settings.gradle

@@ -49,6 +49,7 @@ include ":kotlin-build-common",
         ":js:js.translator",
         ":js:js.dce",
         ":js:js.tests",
+        ":konan:konan-utils",
         ":jps-plugin",
         ":kotlin-jps-plugin",
         ":core:descriptors",
@@ -231,6 +232,7 @@ project(':compiler:ir.psi2ir').projectDir = "$rootDir/compiler/ir/ir.psi2ir" as
 project(':compiler:ir.ir2cfg').projectDir = "$rootDir/compiler/ir/ir.ir2cfg" as File
 project(':compiler:ir.backend.common').projectDir = "$rootDir/compiler/ir/backend.common" as File
 project(':compiler:backend.js').projectDir = "$rootDir/compiler/ir/backend.js" as File
+project(':konan:konan-utils').projectDir = "$rootDir/konan/utils" as File
 project(':kotlin-jps-plugin').projectDir = "$rootDir/prepare/jps-plugin" as File
 project(':idea:idea-android-output-parser').projectDir = "$rootDir/idea/idea-android/idea-android-output-parser" as File
 project(':plugins:android-extensions-compiler').projectDir = "$rootDir/plugins/android-extensions/android-extensions-compiler" as File