Feature Request: Provide TOTP codes if the password field is a TOTP seed

We often store TOTP seeds in teampass so we can get the current code with a command like this:

• ~]$ oathtool -c 30 --base32 --totp ABCDEFG
  669621

It would be nice to have a checkbox with the configuration options (time = 30s, base32, ...) so we can use teampass as a TOTP client.  On the backend you could just invoke oathtool, or maybe there is a PHP library.