refactor: use $$restProps API

- add ref prop for applicable components (#196)
- add slot to Content Switcher `Switch` component (#183)
- remove fillArray, css utilities

src/components/Search/Search.Skeleton.svelte

@@ -1,19 +1,16 @@
 <script>
-  let className = undefined;
-  export { className as class };
   export let small = false;
-  export let style = undefined;
-
-  import { cx } from '../../lib';
 </script>
 
 <div
+  class:bx--skeleton={true}
+  class:bx--search--xl={!small}
+  class:bx--search--sm={small}
+  {...$$restProps}
   on:click
   on:mouseover
   on:mouseenter
-  on:mouseleave
-  class={cx('--skeleton', !small && '--search--xl', small && '--search--sm', className)}
-  {style}>
-  <span class={cx('--label')} />
-  <div class={cx('--search-input')} />
+  on:mouseleave>
+  <span class:bx--label={true} />
+  <div class:bx--search-input={true} />
 </div>