added which transition the vtol is in to vehicle status

msg/vehicle_status.msg

msg/vtol_vehicle_status.msg

src/modules/commander/commander.cpp

src/modules/mavlink/mavlink_messages.cpp

src/modules/vtol_att_control/standard.cpp

src/modules/vtol_att_control/tailsitter.cpp

src/modules/vtol_att_control/tiltrotor.cpp

src/modules/vtol_att_control/vtol_att_control_main.cpp

src/modules/vtol_att_control/vtol_type.h