Stability fixes.
Channel 8 on PAR lights needs to be set to 0.
Split config variables out to their own file.
Rate limit network and disk updates.

Running at full speed was too much for the Raspberry Pi I am running
this application on, mainly due to the network updates.  Rather than
trying to handle every single change, create update processes which
save/send the most recent update.

This is very sub-optimal, but will do for now.
Add support for Z-Wave binary power switches.

There is (currently) no discovery, so you will need to know the node ids
of your switches in advance.  The OpenZWave example program can do this.

With thanks to OpenZWave for laying the groundwork here.