#187 feat(app): the app icon is a box in its tray with the amber lamp lit on top

The Mac app's icon set (icon.icns, icon.ico, the PNGs and the Square logos) now comes from the new dark icon. A dev build's Dock icon (icons/dev/icon.png) is the same box on an orange tile, so a dev build still stands out from the release app.

Not changed here: the mark used for the favicon, the site, the docs and the phone app (the hull).

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