Secrets App: improve UI/UX for Password Safe support

[szszszsz]

Quoting from #380 (comment) and other comments:

• change command names (improve UI)
  • Maybe add-otp and add-password? register could act as an alias for add-otp for compatibility and print a deprecation warning.
  • In that case I’d also use get-otp and get-password with get being an alias for get-otp.
• additional output presentation
  • It should be possible to only print the password for easy scripting.
  • A machine-readable output format could also be useful for more advanced use cases (CSV or JSON).
• update credential feature
• check firmware / app version for the PWS features

[szszszsz]

Fixed by #393
Updating credential extracted to #402
Closing as done