Unify hx- and ccd- actor calls to common ics_utils routines

In INSTRM-1757 most common exposure book-keeping routines were hoisted out of ccdActor and hxActor and added to ics_utils. But some of the older calling sequences and routines were left in place (and different between the two actors), and a few changes were subsequently made to the ccdActor. Fix all these. The trigger for fixing them is from LAM, where the W_PFDSGN from DCB exposures is different between r2 and n2.