AutoTest: Persist check state to project settings

Make it easier to switch between projects and restore
the former check states of the found test items if
we have these information.

Change-Id: I99a5357388c36aa8cce6f5f82184d6ab2a8bf6e8
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/testnavigationwidget.h

@@ -25,10 +25,9 @@
 
 #pragma once
 
+#include "itemdatacache.h"
 #include "testrunner.h"
 
-#include "testtreemodel.h"
-
 #include <coreplugin/inavigationwidgetfactory.h>
 
 #include <utils/navigationtreeview.h>
@@ -49,8 +48,12 @@ class ProgressIndicator;
 }
 
 namespace Autotest {
+
+class TestTreeModel;
+
 namespace Internal {
 
+class TestTreeSortFilterModel;
 class TestTreeView;
 
 class TestNavigationWidget : public QWidget