merge table and standing lamps into the new code
of all the relevant lights, the plasma ball is the only one that remains
on/off-only, since dimmable doesn't make sense there.
That one, and any future lights that get the on/off-only treatment, will
use the previous on/off behavior, i.e. turn off with the messages "off"
or "low" or a number < 4, and turn on with "med", "hi", "max", "on" or
a number > 3
This alters the behavior of table/standing lamps - they will no longer
cycle brightnesses by right-click. Like all other controllable lights,
they'll just toggle on/off. If there's enough demand for it, I'll add
that feature back in at a later date.
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