[openstreetmap-website] Implemented right-click context menu (#1030)

[danstowell]

@HolgerJeromin thanks. Personally I don't favour the idea of adding documentation strings as fake menu entries, though maybe others would disagree with me. I don't have a touch device here but I believe the underlying library should already work with touch-long-hold. Maybe you were just suggesting, but if you tried it and it didn't happen, grateful for details.

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https://github.com/openstreetmap/openstreetmap-website/pull/1030#issuecomment-129555819
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