Add new `header-line-active' and `header-line-inactive' faces
This is all intended to parallel the 'mode-line-active' and
'mode-line-inactive' distinction.
* doc/emacs/display.texi (Standard Faces): Document the new faces.
* lisp/faces.el (header-line-active, header-line-inactive): New
faces.
* src/dispextern.h (CURRENT_HEADER_LINE_ACTIVE_FACE_ID_3)
(CURRENT_HEADER_LINE_ACTIVE_FACE_ID): New macros based on mode
line equivalents.
(face_id): New face IDs.
* src/xdisp.c (window_box_height, pos_visible_p, init_iterator)
(window_text_pixel_size, display_mode_lines, display_mode_line)
(format-mode-line): Replace all uses of HEADER_LINE_FACE_ID with
either a new macro or the new face IDs.
* src/xfaces.c (syms_of_xfaces): New lisp symbols.
(lookup_basic_face, realize_basic_faces): Map new face IDs to
their lisp symbols. (Bug#73862)
(cherry picked from commit
a4014c058b547d4f9c8c61c6737c85c2636fdb34)