Core: Introduce PagedSettings

An AspectContainer with an IOptionsPage.

Change-Id: I03d460f788cfcb2c631b2789bc8f7c74a0b62a37
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/coreplugin/dialogs/ioptionspage.h

@@ -5,6 +5,7 @@
 
 #include <coreplugin/core_global.h>
 
+#include <utils/aspects.h>
 #include <utils/icon.h>
 #include <utils/id.h>
 
@@ -126,4 +127,10 @@ protected:
     Utils::Icon m_categoryIcon;
 };
 
+class CORE_EXPORT PagedSettings : public Utils::AspectContainer, public IOptionsPage
+{
+public:
+    PagedSettings() = default;
+};
+
 } // namespace Core