Device Handler update to support new STSC app

[cscheiene]

@mark_cockcroft This was really useful information, thank you. Im hoping the SmartThings team will provide more information similar to this with other VID/OIC types

Child devices in new app

Thanks @Automated_House, Jody and I had a discussion about this earlier this morning and are already on it. We’re also planning to provide a broader explanation of how DTHs work in OneApp vs. Classic, specifically the difference between attributes and capabilities and what is required to get the latter to render properly in OneApp. Appreciate the help and list - if anyone has topics to add, please let us know and we’ll do our best to make sure there’s clear documentation.