FactoryLists: rework iterating methods
eg gst::ElementFactory::list_get_elements
returns a Vec gst::ElementFactory::list_filter
expects a &[] and returns a Vec, that's all a bit suboptimal :)
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eg gst::ElementFactory::list_get_elements
returns a Vec gst::ElementFactory::list_filter
expects a &[] and returns a Vec, that's all a bit suboptimal :)