Make a better icon and set Windows 10 tile background color

[jwalthour]

How to set windows 10 tile settings: https://superuser.com/questions/1028493/control-the-color-of-individual-start-menu-tiles

Look at the Chrome one for examples.

A better icon would at least have higher-resolution copies, if not be something better than what I whipped up in 10 minutes in Inkscape.