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/weighers/basic/LambdaSignature.kt

@@ -0,0 +1,8 @@
+fun <R> String.fold(initial: R, operation: (acc: R, Char) -> R): R = TODO()
+
+fun foo(p: Int) {
+    "abc".fold(1) { <caret> }
+}
+
+// ORDER: "acc, c ->"
+// ORDER: "acc: Int, c: Char ->"