Consolidate CLI applications

[mcandre]

As a user, I want a single stank application so that I can more quickly apply it to my projects.

• [ ] Move most CLI logic into lib.
• [ ] Offer -inspect flag to have stank operate like stink.
• [ ] Offer -list flag to have stank operate like stank already does, listing POSIXy script paths.
• [ ] By default, have stank operate like funk.
• [ ] Drop funk, stink.
• [ ] Update README
• [ ] Update downstream, shell-oriented projects

Pending #63