target_name: [optional] (string) name of target to face, if applicable (only physical objects are currently supported [aka no navpoints])
path orients:
HELI_PF_FACE_ALONG_PATH - point the front of the helicopter in the direction of the path (default helicopter behavior)
HELI_PF_FACE_TARGET - point the front of the helicopter towards the helicopters current target
HELI_PF_LEFT_SIDE_FACE_TARGET - point the left side of the helicopter towards the current target
HELI_PF_RIGHT_SIDE_FACE_TARGT - point the right side of the helicopter towards the current target
HELI_PF_FACE_DOWN_AT_TARGET - nose of the helicopter should point downwards at max pitch towards current target (special case used for dive-bombing VTOL in mission18)
HELI_PF_PATH_PITCH - same as HELI_PF_FACE_ALONG_PATH, except that the helicopter follows the pitch of the path as well (flies similar to an airplane)