This is intended to parallel the 'mode-line-active/inactive'
and 'header-line-active/inactive' distinction.
* doc/emacs/display.texi (Standard Faces): Document the new faces.
* lisp/faces.el (tab-line-active, tab-line-inactive): Add new faces.
* lisp/tab-line.el (tab-line-faces): Add new faces
to MEMBERS arg of 'defgroup'.
(tab-line-auto-hscroll): Use one of the faces
depending on 'mode-line-window-selected-p'.
* src/dispextern.h (CURRENT_TAB_LINE_ACTIVE_FACE_ID_3)
(CURRENT_TAB_LINE_ACTIVE_FACE_ID): New macros
based on header-line equivalents.
(CURRENT_TAB_LINE_HEIGHT): Use CURRENT_TAB_LINE_ACTIVE_FACE_ID.
(face_id): Use TAB_LINE_ACTIVE_FACE_ID and
TAB_LINE_INACTIVE_FACE_ID instead of TAB_LINE_FACE_ID.
* 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 TAB_LINE_FACE_ID with
either a new macro or the new face IDs.
* src/xfaces.c (lookup_basic_face, realize_basic_faces):
Map new face IDs to their lisp symbols.
(syms_of_xfaces): New lisp symbols.
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