AP_HAL_Linux: external GPS fixed
AP_Compass: added AK8963 support
Rover: added AK8963 support
Plane: added AK8963 support
Copter: added AK8963 support
Antenna: added AK8963 support
AP_HAL: changed default compass for Navio
AP_InertialSensor: prevented MPU9250 from disabling I2C slaves
AP_ADC: added ADS1115 driver
AP_HAL_Linux: added NavioAnalogIn
AP_HAL_Linux: turned NavioAnalogIn on for Navio board