FEATURE: Parse tags inside of props

[grebaldi]

This allows for tags inside of props:

renderer = afx`
    <ul>
        <Collection
            itemRenderer={
                <li>{item.label}</li>
            }
            />
    </ul>
`

[mficzel]

Looking fine by reading

[mficzel]

If this is the way this is done in JSX then let us include this aswell.

[mficzel]

I suggest to rebase this on #15 once this is merged. I will gladly update afx to support this in total afterwards.