Autotest: Partially aspectify autotest settings

This only handles the storage side, all gui/layouting is left for
follow-up changes.

Change-Id: I0f2b6dc82e5d4374528c8a72610a5afe264a72b1
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/itestframework.h

@@ -28,12 +28,13 @@
 #include <utils/id.h>
 
 namespace ProjectExplorer { struct TestCaseInfo; }
+namespace Utils { class AspectContainer; }
 
 namespace Autotest {
 
 class ITestFramework;
 class ITestParser;
-class ITestSettings;
+using ITestSettings = Utils::AspectContainer;
 class ITestTool;
 class ITestTreeItem;
 class TestTreeItem;