[O] Can't set full face attributes in variable org-todo-keyword-faces

[stardiviner]

I have following settings:

```elisp
(setq org-todo-keyword-faces
      '(;;; todo keywords
        ("TODO" :foreground "orange"
         :box '(:color "dim gray" :line-width -1))
        ("URGENT" :foreground "red"
         :box '(:color "dim gray" :line-width -1))))

```

But I check out it's docstring, found variable `org-faces-easy-properties`.

It has value:

```elisp

(setq org-faces-easy-properties '((todo . :foreground) (tag . 
:foreground) (priority . :foreground)))

```

So my `:box` attribute does not work.

I hope I can specify full face attributes in `org-todo-keyword-faces`.

I guess this might need to modify source code.