Avoid rendering JavaScript URLs as clickable links #47
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To avoid running JavaScript taken from JSON files downloaded from the internet in the client we now try to render URLs only as clickable links if the protocol of the URL is safe, which more concretely means HTTP or HTTPS. Other URLs are rendered as plain text. This commit only covers links that are obviously treated as links to external resources.
To avoid duplication, this introduces a new component, SafeLink, that takes the URL and optionally id and target attributes and renders a suitable a-element if the protocol is safe and text otherwise.
Fixes #45