Completion of lambda parameters

Also changed policy for sorting of smart completion items in basic completion

 #KT-16800 Fixed
 #KT-12002 Fixed

idea/idea-completion/testData/handlers/smart/lambda/4.kt.after

@@ -5,4 +5,4 @@ fun bar() {
     foo({ s, stringBuilder -> <caret> })
 }
 
-// ELEMENT: "{ String, StringBuilder -> ... }"
+// ELEMENT: "{ s, stringBuilder -> ... }"