TupleN classes and their usages replaced by Pair and Triple

(KT-2358 Drop tuples)

 #KT-2358 In Progress

libraries/kotlin-swing/src/main/kotlin/kotlin/swing/Frames.kt

@@ -30,8 +30,8 @@ var JFrame.title: String
         setTitle(t)
     }
 
-var JFrame.size: #(Int, Int)
-    get() = #(getSize().sure().getWidth().toInt(), getSize().sure().getHeight().toInt())
+var JFrame.size: Pair<Int, Int>
+    get() = Pair(getSize().sure().getWidth().toInt(), getSize().sure().getHeight().toInt())
     set(dim) {
         setSize(Dimension(dim._1, dim._2))
     }

libraries/kotlin-swing/src/test/kotlin/test/kotlin/swing/SwingSample.kt

@@ -14,7 +14,7 @@ Enter some text here!
     val f = frame("Kool Kotlin Swing Demo") {
         exitOnClose()
         val test = 12
-        size = #(500, 300)
+        size = Pair(500, 300)
 
         val textArea = JTextArea(greeting)