[openstreetmap/openstreetmap-website] Added color preview box in tag browser sidebar (#1779)

[Andy Allan]

I've been reviewing this PR today, and despite my [unresolved objections](https://github.com/gravitystorm) I'm willing to go ahead and accept this PR.

However, in the intervening time the PR has bit-rotted and now has conflicts, mainly due to the [split of browse_helper and browse_tags_helper](https://github.com/openstreetmap/openstreetmap-website/commit/74d2c4336bab2efe44c6bdadf688d26b18e320b3) last year. @stefanb if you're willing to rebase this onto a recent master, that would be helpful. If not, no worries, I can do that in a few weeks time.

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