NTH: Better ON/OFF feedback

[rnone]

Nice to have:

- Longer press on I/O button to turn ON (just accidentally hitting it turns the camera ON)
- Feedback when I/O button when ON telling the user the Camera is shutting down (Right now, you long-press the I/O and then nothing tell you it is turning off before a few seconds)

BTW, the boot time is quiet good. I was fearing a 20/30 seconds but it is very reasonable. Good job.

Thanks.

[Critters]

I have a baby monitor that, when you hold the power button down to turn it off, it shows a progress bar. If you release before that bar hits 100% it cancels the shutdown. Gives pretty good feedback and makes it hard to accidentally turn off