Auto Night mode

[ItamiWasTaken]

With Night Sight set to "Auto" in GCam, the user does not need to switch to modes.
With version 64 of Secure Camera, Night Mode does function as intended.
The difference is, you must change modes as there is no way to automatically do so

My proposed idea is the implement a way to automatically switch to Night Mode when the scene gets dark enough. This would be similar to how GCam handles things, and would be easier for the user.