Prevent the first 8 usages of updateBatteryVoltage/vbat from being
incorrect due to insufficient samples being taken.

Reduce the amount of samples from 32 to 8 but increase the delay between
samples.
Hack WS2811 led strip.  Proof-of-concept.
Update the ws2811 led strip code for orientation and battery warning.

When armed the first half of the strip is green the second half is red.
When disarmed the strip is various shades of red.
When the battery is low the strip will flash.