3 new icons: `caret-left-right`, `caret-up-down`, `horse`

src/_icons/caret-left-right.svg

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+---
+---
+<svg>
+  <path d="M14 18l6 -6l-6 -6v12" />
+  <path d="M10 18l-6 -6l6 -6v12" />
+</svg>

src/_icons/caret-up-down.svg

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+---
+---
+<svg>
+  <path d="M18 10l-6 -6l-6 6h12" />
+  <path d="M18 14l-6 6l-6 -6h12" />
+</svg>

src/_icons/horse.svg

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+---
+---
+<svg>
+  <path d="M7 10l-.85 8.507a1.357 1.357 0 0 0 1.35 1.493h.146a2 2 0 0 0 1.857 -1.257l.994 -2.486a2 2 0 0 1 1.857 -1.257h1.292a2 2 0 0 1 1.857 1.257l.994 2.486a2 2 0 0 0 1.857 1.257h.146a1.37 1.37 0 0 0 1.364 -1.494l-.864 -9.506h-8c0 -3 -3 -5 -6 -5l-3 6l2 2l3 -2z" />
+  <path d="M22 14v-2a3 3 0 0 0 -3 -3" />
+</svg>