[PRERELEASE] Virtual Prestaging

@mbishop thanks for this app. Should it be capable of sync'ing a bulb across CT vs RGB modes? What I mean by that is have the source a RGBW light and have the secondary device(s) also RGBW. Starting from a happy place, say, CT 4000 for both the source + secondaries, if I change the CT and/or Level on the source, the secondaries update. But if I change the source to an arbitrary colour, then the secondaries have their Level adjusted, but remain in a CT mode. Similarly if everything was a colour and then trying to hop back into the CT mode the secondaries remain in RGB mode.

Is this unsupported, or am I doing something wrong? The bulb I'm testing is a Hue and I've tried with both the Advanced Zigbee RGBW and @jonathanb 's Hue driver [RELEASE] Philips Hue Zigbee Driver (not using Hue Bridge)
I turned on all the things.
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