LimitlessLED bulbs actually come in three flavors: RGB, RGBW, and White. The
ledcontroller library used to control these bulbs only supports RGBW and White
bulbs. This changelist adds support for the White bulb variant.
The White bulbs are a bit annoying in that they don't support absolute
brightness or color temperature adjustments; they only support a relative
"increase" or "decrease" adjustment. This, along with the unreliable, one-way
communication medium that requires repeats to be "sure" that the bulb received a
command, makes implementing brightness control difficult. So, for now, these
bulbs are more limited than the RGBW variants and only support On/Off control.
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