Support 24-bit TrueColor on MS-Windows consoleHEADmaster

* src/w32console.c (DEFAULTP, SSPRINTF, w32con_write_vt_seq)
(w32con_get_cursor_coords): New functions and macros.
(w32con_write_glyphs): Hide cursor before writing to the console.
Add code for writing in virtual-terminal mode when
'w32_use_virtual_terminal' is non-zero.
(w32con_write_glyphs_with_face): Add code for writing in
virtual-terminal mode when 'w32_use_virtual_terminal' is non-zero.
(w32con_setup_virtual_terminal): New function.
(w32con_set_terminal_modes): Call it.
(turn_on_face, turn_off_face): New functions.
(initialize_w32_display): Save background and foreground, and the
current TTY.
(Fset_screen_color): Accept an additional optional argument VTP;
if non-nil, arrange for 24-bit display to use the specified
colors.
(Fget_screen_color): Accept an additional optional argument VTP;
if non-nil, return colors used by 24-bit display.
(Fw32_use_virtual_terminal, Fw32_use_virtual_terminal_p): New
functions.
* src/term.c (tty_setup_colors) [WINDOWSNT]: Set up
virtual-terminal sequences for colors.
(init_tty) [WINDOWSNT]: Set up terminfo capabilities for Windows
virtual-terminal.
* src/xdisp.c (redisplay_internal): Don't call set_tty_color_mode
for WINDOWSNT.

* lisp/term/w32console.el (w32-tty-set-base-colors)
(w32-tty-define-base-colors, w32-tty-define-8bit-colors)
(w32-tty-define-24bit-colors, w32-tty-get-pixel): New functions.
(terminal-init-w32console): Remove color setup.
(w32-tty-setup-colors): New function.
* lisp/term/tty-colors.el (tty-color-mode-alist): Add --color
modes for 256 and 24-bit color modes.
* lisp/startup.el (tty-handle-args): Fix --color handling.
* lisp/faces.el (tty-set-up-initial-frame-faces): Set up colors
for MS-Windows consoles.

* etc/NEWS:
* doc/emacs/msdos.texi (Windows Misc):
* doc/emacs/cmdargs.texi (Colors X): Document 24-bit color support
on MS-Windows.
(Bug#79298)

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