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/Interop/Indexer/clang.def

@@ -0,0 +1,16 @@
+headers = clang-c/Index.h clang-c/ext.h clang-c/ExtVector.h
+
+headerFilter = clang-c/**
+
+compiler = clang
+
+compilerOpts = -std=c99 -fPIC
+linkerOpts.linux = -Wl,-z,noexecstack
+
+linker = clang++
+
+linkerOpts = -fPIC
+
+strictEnums = CXErrorCode CXCursorKind CXTypeKind CXDiagnosticSeverity CXLoadDiag_Error CXSaveError \
+    CXTUResourceUsageKind CXLinkageKind CXVisibilityKind CXLanguageKind CXCallingConv CXChildVisitResult \
+    CXTokenKind CXEvalResultKind CXVisitorResult CXResult CXIdxEntityKind