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

idea/testData/quickfix/createFromUsage/createSecondaryConstructor/classWithBody.kt.after

@@ -0,0 +1,12 @@
+// "Create secondary constructor" "true"
+
+class A {
+    constructor(i: Int) {
+        //To change body of created constructors use File | Settings | File Templates.
+    }
+
+}
+
+fun test() {
+    val a = A(1)
+}