Validate all fields from within inquirer

[mhkeller]

Currently, a number of things are validated after you submit your prompts from inquirier. Inquirer also allows you to validate while you're in the prompts, though, which saves time in not having to go back and redo things based on an incorrect password or something else.

The validation still must occur after the prompts because you can bypass the prompts with flags and those values need validation.

The validation functions should be broken out into their own modules and run both in the prompts and afterward.