enhance Sony setting of shutterspeed, iso and exposurebiascompensation.
enhance Sony setting of shutterspeed, iso and exposurebiascompensation.

new sonys allow direct setting of these values (with new props), no need for slow stepping

https://github.com/gphoto/libgphoto2/issues/523

gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2