Merge branch '31-keep-first-skin-only' into 'master'

Resolve "Keep first skin only"

Closes #31

See merge request !28

icons/skins/numbers/3.svg

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icons/skins/numbers/4.svg

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icons/skins/numbers/5.svg

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icons/skins/numbers/6.svg

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icons/skins/numbers/7.svg

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-<svg enable-background="new 0 0 100 100" version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" ry="2" fill="none"/><rect width="100" height="100" fill="#c5c5c5" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-opacity=".5" stroke-width="0"/><g aria-label="7"><path d="m80.33 6.47v7.08q0 3.12-0.72 5.04-0.66 1.92-1.32 3.24l-31.68 66.18q-1.2 2.28-3.24 3.9t-5.52 1.62h-12l32.46-64.62q1.2-2.28 2.46-4.14t2.82-3.54h-40.14q-1.44 0-2.64-1.14-1.14-1.14-1.14-2.58v-11.04z"/></g></svg>

icons/skins/numbers/8.svg

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icons/skins/retro/0.svg

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icons/skins/retro/1.svg

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icons/skins/retro/2.svg

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icons/skins/retro/3.svg

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-<svg enable-background="new 0 0 100 100" version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" ry="2" fill="none"/><rect width="100" height="100" fill="#FFD700" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-opacity=".5" stroke-width="0"/></svg>

icons/skins/retro/4.svg

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-<svg enable-background="new 0 0 100 100" version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" ry="2" fill="none"/><rect width="100" height="100" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-opacity=".5" stroke-width="0"/></svg>

icons/skins/retro/5.svg

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-<svg enable-background="new 0 0 100 100" version="1.1" viewBox="0 0 100 100" xml:space="preserve" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" ry="2" fill="none"/><rect width="100" height="100" fill="#1B13C8" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-opacity=".5" stroke-width="0"/></svg>

icons/skins/retro/6.svg

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icons/skins/retro/7.svg

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icons/skins/retro/8.svg

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icons/skins/symbols/0.svg

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icons/skins/symbols/1.svg

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icons/skins/symbols/2.svg

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icons/skins/symbols/3.svg

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icons/skins/symbols/4.svg

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