Move everything under kotlin-native folder

I was forced to manually do update the following files, because otherwise
they would be ignored according .gitignore settings. Probably they
should be deleted from repo.

Interop/.idea/compiler.xml
Interop/.idea/gradle.xml
Interop/.idea/libraries/Gradle__org_jetbrains_kotlin_kotlin_runtime_1_0_3.xml
Interop/.idea/libraries/Gradle__org_jetbrains_kotlin_kotlin_stdlib_1_0_3.xml
Interop/.idea/modules.xml
Interop/.idea/modules/Indexer/Indexer.iml
Interop/.idea/modules/Runtime/Runtime.iml
Interop/.idea/modules/StubGenerator/StubGenerator.iml
backend.native/backend.native.iml
backend.native/bc.frontend/bc.frontend.iml
backend.native/cli.bc/cli.bc.iml
backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt
backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt
backend.native/tests/link/lib/foo.kt
backend.native/tests/link/lib/foo2.kt
backend.native/tests/teamcity-test.property

kotlin-native/samples/win32/README.md

@@ -0,0 +1,7 @@
+# WIN32 Hello World
+
+To build use `..\gradlew assemble`.
+
+To run use `..\gradlew runReleaseExecutableWin32` or execute the program directly:
+
+    `.\build\exe\main\release\MessageBox.exe`.

kotlin-native/samples/win32/build.gradle.kts

@@ -0,0 +1,14 @@
+plugins {
+    kotlin("multiplatform")
+}
+
+kotlin {
+    mingwX64("win32") {
+        binaries {
+            executable {
+                entryPoint = "sample.win32.main"
+                linkerOpts("-Wl,--subsystem,windows")
+            }
+        }
+    }
+}

kotlin-native/samples/win32/gradle.properties

@@ -0,0 +1,2 @@
+kotlin.code.style=official
+kotlin.import.noCommonSourceSets=true

kotlin-native/samples/win32/src/win32Main/kotlin/MessageBox.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package sample.win32
+
+import kotlinx.cinterop.*
+import platform.windows.*
+
+fun main() {
+    val message = StringBuilder()
+    memScoped {
+      val buffer = allocArray<UShortVar>(MAX_PATH)
+      GetModuleFileNameW(null, buffer, MAX_PATH)
+      val path = buffer.toKString().split("\\").dropLast(1).joinToString("\\")
+      message.append("Я нахожусь в $path\n")
+    }
+    MessageBoxW(null, "Konan говорит:\nЗДРАВСТВУЙ МИР!\n$message",
+            "Заголовок окна", (MB_YESNOCANCEL or MB_ICONQUESTION).convert())
+}