allow Devon's history to be written and read from disk

[emlazzarin]

Often Devon gets stuck with something — either a loop or other bug — and the only path out is to terminate the process and start over. Ideally, the thought process log, scratchpad, etc. that represents Devon's work could be written to disk so it can resume where it left off should the process need to be terminated.

This could also be useful for running tests, forking Devons, or even collaboration between Devons in the future.

[akiradev0x]

@emlazzarin awesome idea, on it. Doing a bug-a-thon tonight and tomorrow, and I'll add this. Thank you for being patient!

[ObjectJosh]

Thanks for the feedback! Related #44

[akiradev0x]

Just closed this out!