Draw.io support

[acovaci]

Describe your suggested feature

Hi, I would love to use the icons on draw.io; the issue is that draw.io expects the SVG in a very specific format.

Luckily the change isn't massive, it would just need a class on the paths, and a style setting the colour on that class. E.g.:

<svg ... >
    <style>
        .icon {
            fill: inherit;
        }
    </style>

    <path class="icon" d="..."></path>
</svg>

This could be exposed as an extra option on the website, along the other download options.

Thanks!