Revamp face-spec-set to be more analogous to setq for faces.

* lisp/faces.el (face-spec-set): Change the third arg to specify
whether this function is being called via defface, customize, or a
third party.  Set the appropriate symbol properties.  Clear the
override spec if setting via Custom.  Initialize face if necessary.
(face-spec-recalc): Allow theme faces to completely replace the
defface spec, in the same way as custom faces (Bug#8454).

* lisp/cus-edit.el (custom-face-set, custom-face-mark-to-save)
(custom-face-reset-saved, custom-face-mark-to-reset-standard):
Simplify by using the new arg to face-spec-set.

* lisp/cus-face.el (custom-declare-face): Move face initialization to
face-spec-set.
(custom-theme-set-faces): Don't initialize the face name here, as
that is now done in face-spec-set.

* lisp/emacs-lisp/lisp-mode.el (eval-defun-1): When evaluating defface,
reset face-override-spec too, and use custom-declare-face.

Fixes: debbugs:4988

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