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

[danstowell]

@tomhughes yes that's correct, Firefox always goes straight to the default context-menu on shift-click. (It can be prevented with some ugly hacking, I think, if someone is deliberately trying to suppress the default.) Disable on shift is mentioned in passing here as an example: https://html.spec.whatwg.org/multipage/forms.html#context-menus "User agents may..."

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https://github.com/openstreetmap/openstreetmap-website/pull/1030#issuecomment-129557788
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