Parameter <-> Receiver Conversion: Support header/impl declarations

#KT-18907 Fixed

idea/testData/multiModuleQuickFix/memberFunParameterToReceiverByHeader/header/header.kt.after

@@ -0,0 +1,9 @@
+// "Convert parameter to receiver" "true"
+
+header class Foo {
+    fun String.foo(n: Int)
+}
+
+fun Foo.test() {
+    "2".foo(1)
+}