IconButton should allow non-material icons

[Vehmloewff]

I am not sure how would be done, but It would be really handy.

[Vehmloewff]

There could be a custom prop that defaults to false.

If custom add the value of icon to the class list on i.
Else use the the material icons.

A Fontawesome implementation would look like this:

<IconButton
	custom
	name="fas fa-star"
/>

This adds great flexibility as well as ease of use.