Codechange: introduce week/quarter triggers for TimerGameCalendar (#11189)

This simplifies code that triggers on these periods.

src/network/network_server.cpp

@@ -1822,6 +1822,15 @@ static IntervalTimer<TimerGameCalendar> _network_yearly({TimerGameCalendar::YEAR
 	NetworkAdminUpdate(ADMIN_FREQUENCY_ANUALLY);
 });
 
+/** Quarterly "callback". Called whenever the quarter changes. */
+static IntervalTimer<TimerGameCalendar> _network_quarterly({TimerGameCalendar::QUARTER, TimerGameCalendar::Priority::NONE}, [](auto)
+{
+	if (!_network_server) return;
+
+	NetworkAutoCleanCompanies();
+	NetworkAdminUpdate(ADMIN_FREQUENCY_QUARTERLY);
+});
+
 /** Monthly "callback". Called whenever the month changes. */
 static IntervalTimer<TimerGameCalendar> _network_monthly({TimerGameCalendar::MONTH, TimerGameCalendar::Priority::NONE}, [](auto)
 {
@@ -1829,7 +1838,14 @@ static IntervalTimer<TimerGameCalendar> _network_monthly({TimerGameCalendar::MON
 
 	NetworkAutoCleanCompanies();
 	NetworkAdminUpdate(ADMIN_FREQUENCY_MONTHLY);
-	if ((TimerGameCalendar::month % 3) == 0) NetworkAdminUpdate(ADMIN_FREQUENCY_QUARTERLY);
+});
+
+/** Weekly "callback". Called whenever the week changes. */
+static IntervalTimer<TimerGameCalendar> _network_weekly({TimerGameCalendar::WEEK, TimerGameCalendar::Priority::NONE}, [](auto)
+{
+	if (!_network_server) return;
+
+	NetworkAdminUpdate(ADMIN_FREQUENCY_WEEKLY);
 });
 
 /** Daily "callback". Called whenever the date changes. */
@@ -1838,7 +1854,6 @@ static IntervalTimer<TimerGameCalendar> _network_daily({TimerGameCalendar::DAY,
 	if (!_network_server) return;
 
 	NetworkAdminUpdate(ADMIN_FREQUENCY_DAILY);
-	if ((TimerGameCalendar::date % 7) == 3) NetworkAdminUpdate(ADMIN_FREQUENCY_WEEKLY);
 });
 
 /**

src/timer/timer_game_calendar.cpp

@@ -215,10 +215,22 @@ void TimerManager<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed delta)
 		timer->Elapsed(TimerGameCalendar::DAY);
 	}
 
+	if ((TimerGameCalendar::date % 7) == 3) {
+		for (auto timer : timers) {
+			timer->Elapsed(TimerGameCalendar::WEEK);
+		}
+	}
+
 	if (new_month) {
 		for (auto timer : timers) {
 			timer->Elapsed(TimerGameCalendar::MONTH);
 		}
+
+		if ((TimerGameCalendar::month % 3) == 0) {
+			for (auto timer : timers) {
+				timer->Elapsed(TimerGameCalendar::QUARTER);
+			}
+		}
 	}
 
 	if (new_year) {

src/timer/timer_game_calendar.h

@@ -34,7 +34,9 @@ class TimerGameCalendar {
 public:
 	enum Trigger {
 		DAY,
+		WEEK,
 		MONTH,
+		QUARTER,
 		YEAR,
 	};
 	enum Priority {