• Added back the optimal clock scrambler from cstimer

I thought the scrambler was the way old one from the original jsss code, but that was replaced in 1.6.0 and was removed in 1.8.0 😵.
Thanks again to @JoshM2 for adding this scrambler back in.

Types that generate optimal clock scrambles are:

• clockoptimal
• clock-optimal
• clock-o