feat(svg_icon): Add standard svg icons

-Adds icons to use with the svg_icon smarty helper in the is_themecore module. See is_themecore-PS9 repo.

- Uses chevron svg icons by default on bootstrap touchspin AND on main menu if it has children.

falcon/_dev/img/bag.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="18.5" height="20.5" viewBox="0 0 18.5 20.5">
+  <g id="Icon_feather-shopping-bag" data-name="Icon feather-shopping-bag" transform="translate(-3.75 -2.25)">
+    <path id="Path_13" data-name="Path 13" d="M7.333,3,4.5,6.8V20.1A1.894,1.894,0,0,0,6.389,22H19.611A1.894,1.894,0,0,0,21.5,20.1V6.8L18.667,3ZM4.5,6.8h17" transform="translate(0 0)" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5"/>
+    <path id="Path_14" data-name="Path 14" d="M19.4,15A3.7,3.7,0,1,1,12,15" transform="translate(-2.7 -4.35)" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5"/>
+  </g>
+</svg>