Add support for color property on SwalComponent

[1fbr]

I have some <swal> components in a project, working fine. As I implemented a dark / light theme, I wanted <swal> background and color to match the current theme.

The background works fine, but color displays Can't bind to 'color' since it isn't a known property of 'swal'.

And yes, color it's not present in the SwalComponent.

Would be nice to add it, because without been able to modify the color you can't really have a custom background properly.