keyring functions

[ijlyttle]

Next step, make it easier to manage auth, including multiple apps/accounts.

The thought is to rely on the keyring package to store the essential information on "your" computers credential-store - we would propose a keyring called r-cardboard.

bx_keyring_create()
bx_keyring_list()
bx_keyring_add(auth, name) # function or name
bx_keyring_get(name, .test = TRUE)
bx_keyring_remove(name)