Update battery warning and turn indicators to use led config.

Cleaned up the battery warning checking as it was being calculated twice
instead of just once per battery warning state cycle.

Updated the code so that modes are shown when disarmed.  Any led's
without the MODE flag will then show the armed state.  In the config in
this commit that results in the corner LEDs being GREEN when disarmed
and OFF when armed.
Update led config so it's possible to show which LEDs show the arm
state.  Mutually exclusive with leds that show MODE.

Use blue to indicate armed, green for disarmed.

Leds not configured for ARM_STATE or MODE will be off by default.

The example combines corner LEDs with ARM_STATE and INDICATOR.  This
results in the corner leds showing arm state and then being overridden
with an indicator color as needed.