Make a futures-based confirmation flow

[LivInTheLookingGlass]

Telegram code needs to be quarantined to a submodule. The easiest way to do this is to define a standard flow for confirming, then having submodules implement hooks for that flow.

Those hooks are

• get_action
• get_action_args
• get_confirmation

Then wrap the following flow in a Future

confirmed = False
args = ()
kwargs = {}
while not confirmed:
    next_step = get_action(explanation)
    explanation += str(next_step) + '\n'
    if next_step requires args:
        args, kwargs = get_action_args(explanation)
        explanation += f'{args}, {kwargs}\n'
    confirmed = get_confirmation(explanation)
return next_step, args, kwargs

[LivInTheLookingGlass]

Will do after #31