Feature: #47006 - Extend the widget identifier with custom string 

See forge#47006

Description 

The parameter customWidgetId has been introduced for fluid widgets. This string is used in the widget identifier in addition to the nextWidgetNumber.

The widget identifier is used to create the GET parameter names.

A good value for the customWidgetId is the {contentObjectData.uid} to ensure no collisions happen.

Example:

<f:widget.paginate customWidgetId="{contentObjectData.uid}" ...></f:widget.paginate>
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Impact 

Allows to use the same fluid widget more than once on one page in different content elements.