Update Tracking code

[knro]

Update skywatcher tracking code to use @jochym updated tracking code from Celestron Auxiliary driver. Not properly tested yet.

[jochym]

That was a lot of changes. Was this all required to implement the predictive tracking, or you just took the opportunity to clean things up?
I am asking because I am planning a second attempt at making it work well and fully controlled, and I would like to understand your port, just to make it easier for eventual factoring (which we should do in the future).
Please, if you have any test results, write to me. It is quite valuable for thinking about how to improve it.

BTW: I have noticed that you have - in your changes - the call to functions updating position of the target if it moves on the sky. CAUX does not have that - and it would make tracking of comets or even satellites possible. How is it working and what is the source of new positions (kstars, other). Maybe we can implement some interface for this type of tracking. In principle, it should be possible - there is no difference between sky tracking and sky+movement for the AltAz mount.

[knro]

Mostly clean up. Also, I guess universal ROR changes were also in there.