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

idea/testData/quickfix/createFromUsage/createFunction/get/createGetFromUsage13.kt

@@ -0,0 +1,10 @@
+// "Create function 'get'" "true"
+import java.util.ArrayList
+
+class Foo<T> {
+    fun bar(arg: String) { }
+    fun <T, V> x (y: Foo<List<T>>, w: ArrayList<V>) {
+        val z = y<caret>["", w]
+        bar(z)
+    }
+}