ludic/changes/render3d-gltf-cached.md

bump: minor type: feature gltf_cached(dir, file, node) loads a still model once. The same directory, file and node asked again hands back the model the first load made, found by comparing the names in place, so a game that places props while it plays - a fish, a bobber, a sign an animal leaves - reads no file and parses no document after the first. The model is shared by every actor drawing it and never released. A model whose document is read after the load (ludic.anim's clips) still goes through gltf_load.