Feature Request: more ZCLv8 features

[ebaauw]

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ZCL v8 defines a quite a few interesting new features, some of which (like execute_if_of) we've already supported. I've come across some more:

Level Control cluster

• Couple Color Temp to Level - automatically adjust the colour temperature when changing the level, to mimic an incandescent light. Quick test reveals this is supported by: Hue ZB3 lights, IKEA lights, Hive;
• Couple Color Temp To Level Min Mireds;

Color Control cluster

• Additional attributes in the Scene Table Extensions: ColorLoopActive, ColorLoopDirection, ColorLoopTime, and ColorTemperatureMireds. Not sure I fancy refactoring the cursed Add Scene logic but this looks promising, notably ColorTemperatureMireds. And probably justifies some more capabilities to indicate what Scene Table Extensions the device supports.

[ebaauw]

Not sure if it makes sense to define Drift Compensation and Compensation Text - haven't found any device yet that supports these.