Reduce reliance on scoped styles, introduce more common components

[annybs]

In many places we see copy-pasted styles, e.g. .listOption and related classes.

In that specific case this can be cleaned up as part of #267 but there are no doubt many other places where classes are copied across multiple components to accomplish the same effect which could be migrated to a single component with global styles.

Known issues

• .listOption (as above)