Show custom option form in order overview (without function)
Refactor: move code from template to block.
Do not show file options
Refactor: Add popup block via observer to additional product
information.
Refactor: Make options block independent of item renderer
Refactor: Moved code to popup block
Add form and controller to save custom options.
Refactor: clean up controller action
Refactor: simplify controller code
Basic design for popup; use custom option wrapper template.
Add comment in order status history.
Do not show options with prices in form.
Restrict order state.
Also change sku of item with custom options.
Do not show form for products without custom options.
Real popup in iframe to avoid conflicts of form element ids and names
Make cancel button close the popup.
Integrate product.js to reuse form handling of product page in popup.
Do not show form if editing is not allowed.
Allow changing of options with type "file".