Add fill=currentColor to svg's
**Is your feature request about the Usage? Please describe.**
Currently when using the `svg` approach, and want to control the color of the icon with the CSS `color` property, you'd have to add `fill="currentColor"` to the paths in each svg icon manually.

**Describe the solution you'd like**
It would be very convenient, if the svgs would already provide that. Like so:
```html
<svg ... >
    <path fill="currentColor" d="..." />
</svg>
```