Better abstraction of platform independent pieces

[seanshahkarami]

I need to do a more thorough review of pieces of code which are not really tied to the hardware.

For example, the command reader / parser has almost nothing to do with the Wagman itself. That is, that same code run on my machine.

This will make it easier to start unit testing some of the more portable pieces of code. Some examples I can think of offhand are:

• Command reader / parser
• Device models / state machines
• Timers / clocks (should be mockable to test events after certain amounts of time have passed)
• Scheduler