Defines all available filters. Each filter must be assigned to a category.
NONE is always added in Basic UI
New items and categories can be mixed and matched with existing predefined ones.
Decide if the categories should be grouped in a collapsible section or should be grouped under a text heading.
Controls if the user can load the preview thumbnail for every filter.
Whether categories should be flattened which effectively hides the categories. If this is enabled all filters will be shown in the top-level of the filter selection tool orderes according to their parent category.