* helper/keystone: rewrite completely
* rack-mount/patch-panel: edit to adapt to the new keystone
* helper/keystone: fill the lug-side opening
* rack-mount/patch-panel: allow combining two types of keystones and
plates freely
* rack-mount/patch-panel/entry: apply suggestions
Co-authored-by: Zhao (Jack) Wang <jazwang@proton.me>
* rack-mount/patch-panel: fix animate.scad & regen gif
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Co-authored-by: Zhao (Jack) Wang <jazwang@proton.me>
