Codechange: migrate all game-time-related timers to the new framework

src/highscore_gui.cpp

@@ -22,6 +22,9 @@
 #include "hotkeys.h"
 #include "zoom_func.h"
 #include "misc_cmd.h"
+#include "timer/timer.h"
+#include "timer/timer_game_calendar.h"
+#include "date_func.h"
 
 #include "widgets/highscore_widget.h"
 
@@ -250,3 +253,14 @@ void ShowEndGameChart()
 	CloseWindowByClass(WC_ENDSCREEN);
 	new EndGameWindow(&_endgame_desc);
 }
+
+static IntervalTimer<TimerGameCalendar> _check_end_game({TimerGameCalendar::YEAR, TimerGameCalendar::Priority::NONE}, [](auto)
+{
+	/* 0 = never */
+	if (_settings_game.game_creation.ending_year == 0) return;
+
+	/* Show the end-game chart at the end of the ending year (hence the + 1). */
+	if (_cur_year == _settings_game.game_creation.ending_year + 1) {
+		ShowEndGameChart();
+	}
+});