Remove the Stop operation.

I'm going to keep it simple for now; you can step through instructions or run them all.
Implement part of the Run loop.

Determine the amount of time that the VM should sleep to emulate the given clock speed, and then sleep in the infinite loop for that duration.

For now, it'll print out a series of dots to stdout at each iteration.
Run the VM once the program is loaded.

Won't do much yet other than spit out dots.