Rearrange kotlin-stdlib-js library sources

Move kotlin.* api inside kotlin directory.
Update copyright paths.

libraries/tools/idl2k/src/main/kotlin/download.kt

@@ -24,7 +24,7 @@ import java.io.File
 import java.net.URL
 
 fun main(args: Array<String>) {
-    val dir = File("../../idl")
+    val dir = File("../../stdlib/js/idl")
     dir.mkdirs()
 
     var packageFilter: String? = null

libraries/tools/idl2k/src/main/kotlin/main.kt

@@ -8,8 +8,8 @@ import kotlin.collections.HashSet
 
 fun main(args: Array<String>) {
     val mdnCacheFile = File("target/mdn-cache.txt")
-    val outDir = File("../../../js/js.libraries/src/generated")
-    val srcDir = File("../../idl")
+    val outDir = File("../../stdlib/js/src/org.w3c")
+    val srcDir = File("../../stdlib/js/idl")
     if (!srcDir.exists()) {
         System.err?.println("Directory ${srcDir.absolutePath} doesn't exist")
         System.exit(1)