New sensor timing block takes too long to switch programs

[oskirby]

The design of the new sensor timing block uses a sequence of instructions to control the sensor timing, which allows a ton of flexibility in programming how the image sensor operates (this allows us to do things like HDR triggering, skipped frames, and other weird stuff). However, when it comes to simple stuff like changing the exposure time, this turns out to be overly complicated.

The problem is that switching exposures requires a change of the timing program in which we need to stop the sensor, load the new program, and then restart it, when all we really need to is change one of the delay times.