Added limits in the widgets for PIDs of AnalogOutpus and fixed
lag when the hide/show button is clicked multiple times
(added disconnect function).
Small change for the spacers in ADwin hardware widgets.

Added adapted class for AnalogOutput with PID control.
This avoids having extra Widgets in the ADwin BLACS Tab,
the PID parameters can be set also in manual mode and the number
of AOut channels with PID is not fixed.

MISSING: Sending data to the right ADwin variables in the Worker and
adapting the ADwin process (to also set PID parameters).