Moodlight color state after reboot / powercycle

[nagyrobi]

Is your feature request related to a problem? Please describe.
Similar to group items, moodlight color, state (and brightness after implemented) should be remembered after reboot / powercycle.
If HA and plate both reboot while the moodlight was turned off, nobody remembers what was the pre-selected moodlight attribute. At HA reboot, the current of moodlight color is read from the plate because HA doesn't keep the color attribute when light is off. If plate also reboots during this time (eg. power outage affecting all devices), nobody remembers what was the pre-selected color.

Describe the solution you'd like
When moodlight command comes in with color key, check if moodlight color info is saved to the flash. If moodlight color info in flash is different of what came with the command, write to flash the new color info (save flash writes if every {"state":"true"} command comes with the same color info every time...)
At boot restore moodlight color info (and state) from flash.

Describe alternatives you've considered
Only this

Additional context
Not applicable

[fvanroie]

Moved to #99 .