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

idea/testData/quickfix/createFromUsage/createFunction/delegateAccessors/varMissingSet.kt.after

@@ -0,0 +1,12 @@
+// "Create function 'set'" "true"
+class F {
+    fun get(x: X, propertyMetadata: PropertyMetadata): Int = 1
+
+    fun set(x: X, propertyMetadata: PropertyMetadata, i: Int) {
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+}
+
+class X {
+    var f: Int by F()
+}