Add a property or method that controls the number of sigfigs

[APRashedAhmed]

Expected Behavior

Typing in snd.sigfigs = 4 causes all readouts from devices to report only to four sigfigs. If snd.t1.tth.sigfigs = 3 is typed in, snd.t1.tth motors report to three sigfigs while all other devices report to four sigfigs.

Current Behavior

Sig figs are hardcoded in the readouts for each device.

Possible Solution

Implement sigfigs as a common property that when set changes the properties of all child components.