Implement fc-list --verbose (#13015)
A private FcObjectGetSet() is implemented that provides an FcObjectSet of all registered elements. FcFontSetList() is then modified to use the object set from FcObjectGetSet() if provided object-set is NULL. Alternatively FcObjectGetSet() can be made public. In that case fc-list can use that as a base if --verbose is included, and also add any elements provided by the user (though that has no effect, as all elements from the cache are already registered). Currently fc-list ignores user-provided elements if --verbose is specified.
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