JET-140 Change function type syntax

and tests for
JET-168 Improve the parser for function and tuple types as receiver types

idea/testData/codegen/classes/closureWithParameterAndBoxing.jet

@@ -2,6 +2,6 @@ fun box() : String {
     return if (apply( 5, {(arg: Int) => arg + 13 } ) == 18) "OK" else "fail"
 }
 
-fun apply(arg : Int, f : {(p:Int) : Int}) : Int {
+fun apply(arg : Int, f : fun (p:Int) : Int) : Int {
     return f(arg)
 }