added RuntimeException, NoSuchElementException and missing Iterator.remove() function

js/js.libraries/src/core/core.kt

@@ -25,6 +25,8 @@ fun safeParseDouble(s : String) : Double? = js.noImpl
 library
 open class Exception() : Throwable() {}
 library
+open class RuntimeException() : Exception() {}
+library
 class NumberFormatException() : Exception() {}
 
 native

js/js.libraries/src/core/javautil.kt

@@ -19,6 +19,7 @@ library
 public open class Iterator<T>() {
     open fun next() : T = js.noImpl
     open fun hasNext() : Boolean = js.noImpl
+    open fun remove() : Unit = js.noImpl
 }
 
 library
@@ -173,4 +174,8 @@ library
 public class StringBuilder() {
     public fun append(obj : Any) : StringBuilder = js.noImpl
     public fun toString() : String = js.noImpl
-}
+}
+
+library
+class NoSuchElementException() : Exception() {}
+