message: camera: actually use using namespace
diff: @@ -119,7 +119,7 @@ void CameraImpl::take_photo_async(const Camera::result_callback_t &callback)
  1.0f, // take only one picture
  float(_capture_sequence++),
  NAN, NAN, NAN},
  - std::bind(&CameraImpl::receive_command_result, std::placeholders::_1, callback),
  + std::bind(&CameraImpl::receive_command_result, _1, callback),
  MAV_COMP_ID_CAMERA);
  }
  @@ -141,7 +141,7 @@ void CameraImpl::start_photo_interval_async(float interval_s,
  0.0f, // unlimited photos
  float(_capture_sequence++),
  NAN, NAN, NAN},
  - std::bind(&CameraImpl::receive_command_result, std::placeholders::_1, callback),
  + std::bind(&CameraImpl::receive_command_result, _1, callback),
  MAV_COMP_ID_CAMERA);
  }
  @@ -151,7 +151,7 @@ void CameraImpl::stop_photo_interval_async(const Camera::result_callback_t &call
  MAV_CMD_IMAGE_STOP_CAPTURE,
  MavlinkCommands::Params {0.0f, // Reserved, set to 0
  NAN, NAN, NAN, NAN, NAN, NAN},
  - std::bind(&CameraImpl::receive_command_result, std::placeholders::_1, callback),
  + std::bind(&CameraImpl::receive_command_result, _1, callback),
  MAV_COMP_ID_CAMERA);
  }
  @@ -163,7 +163,7 @@ void CameraImpl::start_video_async(const Camera::result_callback_t &callback)
  NAN, // fps not set yet
  NAN, // resolution not set yet
  NAN, NAN, NAN, NAN},
  - std::bind(&CameraImpl::receive_command_result, std::placeholders::_1, callback),
  + std::bind(&CameraImpl::receive_command_result, _1, callback),
  MAV_COMP_ID_CAMERA);
  }
  @@ -173,7 +173,7 @@ void CameraImpl::stop_video_async(const Camera::result_callback_t &callback)
  MAV_CMD_VIDEO_STOP_CAPTURE,
  MavlinkCommands::Params {0.0f, // Reserved, set to 0
  NAN, NAN, NAN, NAN, NAN, NAN},
  - std::bind(&CameraImpl::receive_command_result, std::placeholders::_1, callback),
  + std::bind(&CameraImpl::receive_command_result, _1, callback),
  MAV_COMP_ID_CAMERA);
  }
  @@ -224,7 +224,7 @@ void CameraImpl::set_mode_async(Camera::Mode mode, const Camera::mode_callback_t
  mavlink_mode,
  NAN, NAN, NAN, NAN, NAN // Reserved
  },
  - std::bind(&CameraImpl::receive_set_mode_command_result, this, std::placeholders::_1, callback,
  + std::bind(&CameraImpl::receive_set_mode_command_result, this, _1, callback,
  mode),
  MAV_COMP_ID_CAMERA);
  }
  