Icon: Reconsider color API for standard SVG icons

[mirka]

What problem does this address?

The most common use of the Icon component involves the standard SVG WordPress icons or similar single-color SVG icons. Currently, there is no official API to control the color of the SVG fill.

This often leads to subtle differences in blacks (e.g. if the SVG fill is by default #000000 and the text color is a slightly lighter black). Or, it requires ad hoc CSS to override the fill color.

What is your proposed solution?

Add a fillColor prop that defaults to currentColor so most cases will just match the surrounding text color automatically.

The tricky part about this is backwards compatibility, and also the fact that Icon technically accepts things that are not SVGs. We'll need to decide what the best strategy is, whether that be deprecation or adding a new component that's specific to single-color SVG icons.

[github-actions]

Hi,
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