util for generating nested vnodes

[fuzetsu]

• exposed through n property of m instance

An idea... I like it and use it in a few projects, especially when I'm using a css library like bootstrap or bulma, since they use so many nested html elements with just classes.

Would grow library size by ~54b.

Usage looks like this:

const m = microh(preact.h)
const vnodes = m.n('li.list-item > a.menu-link', { href: '#' })
// vnodes === m('li.list-item', m('a.menu-link', { href: '#' }))