refactor(components): remove exported "props"

Closes #17

- Forward events
- Adds style prop, removes exported props

src/components/ListItem/ListItem.svelte

@@ -1,13 +1,13 @@
 <script>
   let className = undefined;
   export { className as class };
-  export let props = {};
+  export let style = undefined;
 
   import { cx } from '../../lib';
 
   const _class = cx('--list__item', className);
 </script>
 
-<li {...props} class={_class}>
+<li on:click on:mouseover on:mouseenter on:mouseleave class={_class} {style}>
   <slot />
 </li>