Introduce -v/--verbose option

This change introduces a new option, -v/--verbose, that can be used to
increase the log level of libnitrokey. The option can be supplied
multiple times, with each occurrence increasing the verbosity of the
logging.
On the implementation side, the option is set as part of connecting the
device (piggy-backing on the previously introduced command execution
context), although it describes global state that strictly speaking could
be set anywhere. It is bad enough that libnitrokey just prints log
messages to stderr (and does not accept a file handle) and that it does
not track the log level on a per-device basis, but we don't want setting
of global state from arbitrary locations inside the program. Instead,
let's do that along with what pretty much is the first call into
libnitrokey anyway: the connection to the device.

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