Add device selector #71
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Instead of having each example specify which device it wants to use, we can call getDevices(). This always adds a Simulator device, but if process.env.DEVICE is truthy, it will search for a real DAC. If process.env.DEVICE is the name of a DAC, it will use that without searching.
This pull also adds a method to Device so we can ask if the device is supported on the current system. Right now, this is only used to check the OS on windows-only DACs.
Note that I based this branch off add-shutdown-handler, so the changes from #70 are also included here.