J2K: replace overloads with optional parameters not only for constructors but for methods too

j2k/testData/fileOrElement/overloads/Simple.kt

@@ -0,0 +1,10 @@
+class A {
+    overloads fun foo(i: Int, c: Char = 'a', s: String = "") {
+        println("foo" + i + c + s)
+    }
+
+    overloads fun bar(s: String? = null): Int {
+        println("s = " + s!!)
+        return 0
+    }
+}