Allow color logos for the various SVG versions

With an SVG icon, you can change the color of the whole icon with `fill`, so it doesn't matter what color the individual files are born with.

For some logos, like Google Photos, it's really important they have color. We should see if there's a way to make the scripts not strip out color attributes, if not for all logos, then at least optionally for some of them.

Here's a Google Photos logo, for example:

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Locate the scripts that generate the various SVG versions and identify where color attributes are stripped. Determine whether color preservation can be optional for selected logos, then verify that color logos such as Google Photos retain their individual colors without breaking the existing single-color variants.

Written by the indexing model from the issue text.