[libview] Split EvPixbufCache into dynamic and static data
Dynamic page data (page surfaces and selections) that depend on current scale/rotation, keep in EvPixbufCache with the current cache approach. Static page data (links, annots, images, text and forms) that don't depend on current scale/rotation, have been moved to EvPageCache and they are never removed from the cache. Fixes bgo#602405.
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