Childtile in new app

[doncaruana]

@Automated_House

If you’re on a deadline, I’d just release the DTH conforming to current new app limitations and update later if ST ever shed light on this being possible for switches.

@Automated_House - Not a deadline, per se, but did want to get it pushed out at least (which I just did).

@johnconstantelo - coincidentally enough…[OBSOLETE] Zooz Zen30