create functions for get_password() and set_password()

[ljm42]

This makes it easier to override password handling locally
See #141

[jmurty]

Hi @ljm42 I like this change thanks, but I think it could be even clearer if the new functions could be called load_password() and save_password() instead of using the get/set prefixes. This would also remove the need to rename the existing get_password() function to get_password_from_user()

What do you think?

[ljm42]

Great idea! Can you squash these to a single commit? Or I could create a new PR on a clean branch if you'd like?

[jmurty]

It’s fine to make changes on this branch. I’ll squash at merge time

[ljm42]

Perfect. This should be good unless you see other issues