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

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

@@ -0,0 +1,9 @@
+// "Create function 'foo'" "true"
+
+fun test(o: Any) {
+    if (o is String) foo(o)
+}
+
+fun foo(o: String) {
+    throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+}