AC_PosControl: cast fabs to float to resolve compiler warnings
AC_PosControl: init members to resolve compiler warnings
AP_InertialNav: append f to floating point constants

Reduces some compiler warnings
AP_InertialNav: init members to reduce compiler warnings
AC_Fence: append f to floating point constants
AP_InertialNav: remove virtual qualifier from error_count
Inav_EKF: init member and remove hal reference to reduce compiler warnings
Copter: add parenthesis around ntun log bitmask

Resolves one compiler warning
AC_Sprayer: append f to floating point constants

Reduces some compiler warnings
AP_Airspeed: use 'no break' to resolve compiler warning re switch
AP_Airspeed: init members to reduce compiler warnings
Camera: remove unused reference to hal

Resolves one compiler warning
AP_InertialSensor: init members to reduce compiler warnings
AP_InertialSensor_MPU6k: init members to reduce compiler warnings
AC_AttitudeControl: Use bias-corrected angular rates instead of raw gyro measurements
Copter: updated AttitudeControl ctor call to reflect changes
AC_AttControl: add empty virtual destructor

This resolves pixhawk bricking and reduces one compiler warning
AP_AHRS: add empty virtual destructor
AP_InertialSensor: add empty virtual destructor
AC_AttControl: initialise _acro_angle_switch

Resolves a compiler warning