Refine use of vc-dir faces; apply to all backends

Refine use of vc-dir faces; apply to all backends

* lisp/vc/vc-dir.el (vc-default-dir-printer): Add check for the
"ignored" status and make 'vc-dir-status-edited' the default face.
Also extend condition for more states that qualify as "warnings".

(vc-dir-ignored, vc-dir-status-ignored): Rename face for consistency.

* lisp/vc/vc-git.el (vc-git-dir-printer): Use the
'vc-dir-status-edited' as the default for the Git backend.  And
reference the renamed face.  Also stop treating the empty stash
differently from other header values.

* lisp/vc/vc-bzr.el (vc-bzr-dir-extra-headers): Implement new faces.
* lisp/vc/vc-cvs.el (vc-cvs-dir-extra-headers): Same.
* lisp/vc/vc-hg.el (vc-hg-dir-extra-headers): Same.
* lisp/vc/vc-svn.el (vc-svn-dir-extra-headers): Same.

This follows from the discussion in bug#46358.