(DebPrint, reset_kbd, unset_kbd, take_console): Delete functions.

(DebPrint, reset_kbd, unset_kbd, take_console): Delete functions.
(keyboard_init_hook): Delete variable.
(prev_console_cursor) [! USE_SEPARATE_SCREEN]: New variable.
(reset_terminal_modes) [! USE_SEPARATE_SCREEN]: Reset cursor info.
(initialize_w32_display) [USE_SEPARATE_SCREEN]: Create separate
screen buffer.
(ctrl_c_handler): Only ignore interrupts when interactive.
(set_terminal_modes): Set input mode.
(initialize_w32_display): Record original settings.
Don't reset cursor or clear frame.