BlackBox Component Builder

In case of operating BlackBox in a shared office or in a train, for example,
it is required to offer a feature for shutting off the beep created by a call
to Dialog.Beep. The Edit->Preferences... dialog should be used for storing
the user's preference with respect to suppressing the beep or not.
It should be noted that the beep cannot be shut off by setting the speaker volume
to zero because the beep is created by using a dedicated output device
at least on many if not all Windows PCs.

A proposal for this feature exists in CPC 1.7 rc5.
Proposed by J. Templ 21.11.2013.

Refers to CPC 1.7 rc5 change list numbers 51 and 52.