editDelay property should be configurable, i.e a value, not just on|off

Summary:
Uniface: editDelay property should be configurable, i.e a value, not just on|off

Symptoms:
To use the onEdit trigger, you can give an editbox the property

OnEdit=True

You can also specify whether or not a short delay should occur before
the trigger fores:

EditDelay=True|False

However the delay value is hardcoded to 200 ms. While this seems to be
adequate in many situations it might not be in some. If you are a slow typist
it might mean that the trigger fires on EVERY keystroke, which may be
disruptive if the trigger has some real work to do like doing a substantial
database query.

It is therefore necessary that you can specify the actual value of the
delay, e.g.

EditDelay=1000

to get 1 second instead of 200ms.