Port system tray away from SNI dataengine

[Konrad Materka]

Hi,

I think I'm finally ready to take https://phabricator.kde.org/T13319 :)
What is the best approach to DataEngine migration? It was/is a singleton,
but System Tray can be instanced several times. In addition the SNI model
can be quite heavy, it will use DBus a lot and will cache values (including
images).Is it OK to put it in SystemTrayModel or should I create a
singleton/plugin?

Is there any example (similar migration) that I can check?

-- 
Regards,
Konrad Materka
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