Do not print newly generated passwords by default

[bumi]

Currently gopass generate prints the newly created password by default.
As this is sensitive data I think it should not be printed by default. We could add a flag (similar --clip) to additionally print the generate password.

The --force for generate (overwrite existing password) differs from show (display password). Maybe it would make sense to unify these?

[dominikschulz]

Actually I'd keep the default (to be discussed, but my preference), but add a flag to copy it to the clipboard.

[bumi]

The flag to copy it to the clipboard is already there, that works fine.

In my flow I dislike that coming back to the terminal after a few hours the password is still displayed and might get exposed.

[bumi]

awesome!
though actually I also would not default to copying the password to the clipboard on creation :)
but yeah it totally solves that the password gets accidentally exposed.

thanks for all the work! gopass is such a great and helpful piece of software!