Baro_Glitch: initial version of baro glitch protection

Based on GPS Glitch protection library
Notify: add baro_glitch flag
InertialNav: skip baro updates when glitching

Also resets inertial nav alt estimate once glitch clears
INav_EKF: accept baro_glitch in constructor

Required so it can create an InertialNav object
Copter: integrate baro glitch protection
SITL: add ACC_BIAS and BARO_GLITCH parameters

These allow testing accelerometer bias which often comes from vibration
and sudden changes in baro altitude.
HAL_AVR_SITL: integrate ACC_BIAS and BARO_GLITCH

Adjust simulated accelerometer values and barometer altitude
Notify: RGB led flashes yellow-purple for baro warning
Notify: baro warning tone alarm