Move exceptions to kotlin package in JS library, introduce type aliases for exceptions in kotlin package in JVM runtime.

#KT-18 Fixed

libraries/stdlib/src/kotlin/collections/AbstractIterator.kt

@@ -1,6 +1,5 @@
 package kotlin.collections
 
-import java.util.NoSuchElementException
 
 private enum class State {
     Ready,

libraries/stdlib/src/kotlin/text/Strings.kt

@@ -20,9 +20,6 @@
 
 package kotlin.text
 
-import java.util.NoSuchElementException
-import kotlin.text.MatchResult
-import kotlin.text.Regex
 
 /**
  * Returns a sub sequence of this char sequence having leading and trailing characters matching the [predicate] trimmed.

libraries/stdlib/src/kotlin/util/Preconditions.kt

@@ -2,9 +2,6 @@
 @file:kotlin.jvm.JvmName("PreconditionsKt")
 package kotlin
 
-import java.lang.IllegalArgumentException
-import java.lang.IllegalStateException
-
 /**
  * Throws an [IllegalArgumentException] if the [value] is false.
  */