Tidy up.  sendInterval now an attribute. Fix timing in cmdqueue
* Put all commands for RGBW/White at beginning.  Add percent up/down to dimup/dimdown commands.
* Clean up logging messages, rename High Level Command Queue to Command Queue
* Add repeat parameter to SetHSV for reliability/speed
* Limit steps to max steps on hardware
* Limit steps to bridge delay *3 since most steps require 3 commands to complete
* This should give smoother transitions – note that delay will double for each bulb running a transition simultaneously if connected to the same bridge.
* Set DoTrigger on readingsUpdate
* Add transitionInProgress flag
* Add event-on-change-reading flag