This PR adds functionality to `resin sync` to try to infer what the
device uuid is as follows:
- If the argument to `resin sync` is an app, get all the devices from
that application. If there is only one, auto-select it, otherwise show
an interactive drive selection widget.
- If the argument to `resin sync` is a uuid, use it directly, without
trying to infer anything.
- If no argument is passed to `resin sync`, display an interactive
selection widget showing all your devices from all your applications.
Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>
