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/SingleParameter.kt

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