bug#48672: outline faces

[ludvig-faddeev@gmx.com]

Currently outline faces uses name faces taken for ather purposes than outline
headings.

font-lock-function-name-face))
  "Level 1.")

(defface outline-2
  '((t :inherit font-lock-variable-name-face))
  "Level 2.")

(defface outline-3
  '((t :inherit font-lock-keyword-face))
  "Level 3.")

(defface outline-4
  '((t :inherit font-lock-comment-face))
  "Level 4.")

(defface outline-5
  '((t :inherit font-lock-type-face)
 "Level 5.")

(defface outline-6
  '((t :inherit font-lock-constant-face))
  "Level 6.")

(defface outline-7
  '((t :inherit font-lock-builtin-face))
  "Level 7.")

(defface outline-8
  '((t :inherit font-lock-string-face))
  "Level 8.")

It would be appreciated that outline faces have their own faces rather than inheriting
faces for faces assigned to functions, keywords, comments, etc...

Regards
Ludvig