IsPromptable reports whether the output type permits prompts to be shown.

IsPromptableOnce reports whether the given context permits prompts to be shown and also whether a prompt has not been shown before.

SetPrompted tracks whether a prompt has been called before using the config type and key.

OnceKey contants enumerate relevant config keys.

Configurer describes the behavior required to track info via config.

Contextualizer describes any type which can provide needed contextual info.

OnceKey represents config keys as tokens.