Update icons to Zotero 7 style

[adomasven]

With Zotero 7 beta available, we can probably just do this immediately. That way we can also address #487

[dstillman]

This would also be the time to consider badging the icon with a red Z, like people have been asking us to do for years.

[dstillman]

(Though we can just swap in the new icons first just to get it done.)

[adomasven]

This would also be the time to consider badging the icon with a red Z, like people have been asking us to do for years.

Like this?

[dstillman]

Without the huge knockout, but yeah

[adomasven]

That is the badge background. It can't be made transparent. Or the badge has to be baked into the icons, but that will not look good.

[dstillman]

Oh, no, I meant we just badge the icons. This looks terrible, so this is not an option.

[dstillman]

@yexingsha can take a look at baking it in.

[adomasven]

We generate greyscale icons for safari (with imagemagick), because if not safari used to do it itself and poorly. Safari now allows colored icons in extensions. Shall we stop doing that?

[dstillman]

Yes! I hate the Safari icons.