All functions
get_credentials get_credentials_via_readline get_credentials_via_rstudioapi get_credentials_via_shiny get_credentials_via_tcltk	Get credentials
guess_user	Guess at username
list_credentialing_options get_recommended_credentialer get_first_available_credentialer is_readline_credentialing_available is_readline_credentialing_recommended is_rstudioapi_credentialing_available is_rstudioapi_credentialing_recommended is_shiny_credentialing_available is_shiny_credentialing_recommended is_tcltk_credentialing_available is_tcltk_credentialing_recommended	Determine how Credentials can be Gathered