[tfsdsywz] Disable battery

Create software to give the user control of what happens when a battery powered device is unplugged from wall power.

Most aggressive is to immediately turn off the device, essentially disabling the battery.  Such a feature may be useful if the device is seized in a raid, and law enforcement attempts to move the device while keeping it powered on.  The device powers off in response to the attempt to move it, then requiring, for example, a password on boot to unlock full disk encryption on boot.

These could be defeated by cold boot attacks against memory or devices like the Hotplug, but that requires more effort by the raiders.

Less aggressively, the screen can lock when switching from AC power to battery, again requiring a password to unlock.