Improve ui icons

tools/assets/icons/ui/README.md

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+UI icons sources
+=====
+
+Icons used in UI mainly come from [iconoir](https://iconoir.com/)

tools/assets/icons/ui/coins-swap.svg

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+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M9.019 9A6.5 6.5 0 1115 14.981M8.5 22a6.5 6.5 0 110-13 6.5 6.5 0 010 13zM22 17a3 3 0 01-3 3h-2m0 0l2-2m-2 2l2 2M2 7a3 3 0 013-3h2m0 0L5 6m2-2L5 2" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></svg>

tools/assets/icons/ui/eye-close.svg

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+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M19.5 16l-2.475-3.396M12 17.5V14M4.5 16l2.469-3.388M3 8c3.6 8 14.4 8 18 0" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></svg>

tools/assets/icons/ui/zoom-in.svg

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+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M8 11h3m3 0h-3m0 0V8m0 3v3M17 17l4 4M3 11a8 8 0 1016 0 8 8 0 00-16 0z" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></svg>

tools/assets/icons/ui/zoom-out.svg

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+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M17 17l4 4M3 11a8 8 0 1016 0 8 8 0 00-16 0zM8 11h6" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></svg>