Big change in quickfix tests: no stupid test data format with "before" and "after" file prefixes

idea/testData/quickfix/createFromUsage/createFunction/call/funOnUserObject.kt.after

@@ -0,0 +1,11 @@
+// "Create function 'foo'" "true"
+
+object A {
+    fun foo(i: Int): Int {
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+}
+
+fun test() {
+    val a: Int = A.foo(2)
+}