Add iteration icons (#997)

* Add `iteration-ccw` icon

* Add `iteration-cw` icon

* Refine `iteration-*` icons

---

Co-authored-by: Karsa <karsa@karsa.org>

icons/iteration-ccw.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "../icon.schema.json",
+  "tags": [
+    "arrow",
+    "right"
+  ],
+  "categories": [
+    "arrows",
+    "design"
+  ]
+}

icons/iteration-ccw.svg

@@ -0,0 +1,14 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M20 10c0-4.4-3.6-8-8-8s-8 3.6-8 8 3.6 8 8 8h8" />
+  <polyline points="16 14 20 18 16 22" />
+</svg>

icons/iteration-cw.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "../icon.schema.json",
+  "tags": [
+    "arrow",
+    "left"
+  ],
+  "categories": [
+    "arrows",
+    "design"
+  ]
+}

icons/iteration-cw.svg

@@ -0,0 +1,14 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M4 10c0-4.4 3.6-8 8-8s8 3.6 8 8-3.6 8-8 8H4" />
+  <polyline points="8 22 4 18 8 14" />
+</svg>