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

idea/testData/quickfix/createFromUsage/createClass/callExpression/callWithLibClassQualifier.kt

@@ -0,0 +1,9 @@
+// "Create class 'Foo'" "false"
+// ACTION: Create extension function 'Foo'
+// ACTION: Replace with infix function call
+// ACTION: Split property declaration
+// ERROR: Unresolved reference: Foo
+
+fun test() {
+    val a = 2.<caret>Foo(1)
+}