AutoTest: Clean up header mess

Better decoupling and reduced binary size.

Change-Id: I4f6239979d9d7dae4ad92f19ec8420be38372c07
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/itestframework.h

@@ -25,12 +25,13 @@
 
 #pragma once
 
-#include "testtreeitem.h"
-#include "itestparser.h"
+#include <utils/id.h>
 
 namespace Autotest {
 
+class ITestParser;
 class ITestSettings;
+class TestTreeItem;
 
 class ITestBase
 {