Binds a multi-dimensional array of partial strings and
elements to a host element.
let sub = raekwon.observed(['<div></div>'])
let arr = ['<h1>', 'Test', '</h1>', sub]
let el = document.createElement('test')
let proxy = raekwon(el, arr)
setTimeout(() => {
el.innerHTML === '<h1>Test</h1><div></div>'
let div = document.createElement('div')
div.id = 'test-next'
proxy.push(div)
setTimeout(() => {
el.innerHTML === '<h1>Test</h1><div></div><div id="test-next"></div>'
}, 10)
}, 10)