Extract function for parsing completion switches

Both "define-command" and "prompt" use the same logic, so share
it. This will make it easy to implement "prompt -menu".

This reveals a problem with PromptCompleterAdapter: when converting
it to std::function and then to bool, it always evaluates to true
because it has an operator().  However, it should evaluate to false
if the adaptee holds no valid function (e.g. is a default-constructed
std::function). Otherwise we try to call a non-existant function. Tweak
PromptCompleterAdapter to work for empty inputs.

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