KPageDialog: Add a new face type with a flat list of small icons
This offers a way to show preferences dialogs with a flat list and small icons instad of the more classic list with big icons.
It has been requested for some applications (utilities/kate!683 (comment 417753)) that would like to have a preference dialog more similar to SystemSettings sidebar view.
It uses the default list delegate for the QListView instead of the custom delegate that did set the big icons list. If further customization is needed, we could create a new delegate and set it for this case.
Example with Kate preferences:
Classic List
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New FlatList
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