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

idea/testData/quickfix/createFromUsage/createFunction/get/createGetFromUsage4.kt.after

@@ -0,0 +1,10 @@
+// "Create function 'get'" "true"
+class Foo<T, S: Iterable<T>> {
+    fun <U> x (y: Foo<U, Iterable<U>>) {
+        val z: U = y[""]
+    }
+
+    private fun get(s: String): T {
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+}