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/smart/lambdaSignature/NotInBody.kt

@@ -0,0 +1,7 @@
+fun foo(p: Int) {
+    "abc".fold(1) { acc, c -> <caret> }
+}
+
+// EXIST: p
+// ABSENT: "acc: Int, c: Char ->"
+// ABSENT: "acc, c ->"