Allow setting trusted domains for links at run-time

It can be set either:

1. In the product.json (normally the product.json is embedded during the
   build and not read at run-time).
2. With the --link-protection-trusted-domains flag.

patches/series

@@ -20,3 +20,4 @@ getting-started.diff
 keepalive.diff
 clipboard.diff
 display-language.diff
+trusted-domains.diff