Add dark version icon samples to map info page

[jidanni]

Please definitely add a second column, containing the dark versions mentioned in the last paragraph in the image below. That way we can tell the difference, and get more familiar with, both the light and dark versions of each color icon. Thanks.

In fact, perhaps add a third column: clusters. That way we have a idea of what clusters of each color might look like. We are not sure what that gray cluster represents above. Because none of the icon samples are gray.

Maybe it is a cluster of already discovered 4G towers, in dark blue = gray? If so then perhaps mention that.

[zamojski]

The icons have the same colors in both themes but they're a little bit transparent which makes them appear lighter or darker.

The cluster is not a single sample, it's rather what you can see here:

[jidanni]

The cluster example needs a number in it. Because all clusters always have numbers.

[jidanni]

And yes, maybe repeat each icon, first on a white background and then on a dark background. It would just add one more column to the table.

You could even have the white and dark backgrounds join each other right underneath a single icon, which would be split in between the two.