Adding more tags for blocking -> <audio>, <video>, <source>, ...

Now other tags can be blocked that could potentially send the visitors IP to a third party server.
The Eel helpers are more generalized.

    @process.blockTags = ${CookiePunch.blockTags(["iframe", "script"],value, !node.context.inBackend)}
    @process.neverBlockTags = ${CookiePunch.neverBlockTags(["iframe", "script"],value, !node.context.inBackend)}