Antiforgery token integration

[egil]

For components with @attribute [RequireAntiforgeryToken(required: true)], do the following:

• [ ] An element has an hx- action attribute (except GET) NOT inside a form, add a hxor-aft attribute whose value is the antiforgery token to the element.
• [ ] Update htmxor.js to look for an hxor-aft when triggered on an element.
• [ ] An element has an hx- action attribute (except GET) inside a form, ensure the standard hidden input field is rendered to the dom with the antiforgery token before the end of the form, if not already provided.

[egil]

It looks as if this would require searching through up the render tree during HTML writing, so the current solution is probably better for now.