Generalize terminology from "PIN" to "secret"

In the past we have worked solely with PINs. PINs in our (or rather, the
Nitrokey's) sense are not necessarily numbers but they can be reasonably
short in length, because they can only be retried a limited number of
times.
In the future, however, we will introduce the notion of a password,
which does not carry such a restriction.
The commonality between the two is that they are secrets and so with
this change we refer to secrets -- rather than PINs -- in places where
both passwords and PINs can conceptually be used.

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