Codechange: rework NewGRFProfiler to use ticks instead of calendar-days (#10815)

We are planning to allow things like freezing the calendar, which
makes this variable a bit problemetic. So instead, suggest to the
user how many ticks there are in a calendar day, and let them figure
out how many ticks they want.

Additionally, use a TimeoutTimer for this, instead of an end-date
variable which is checked in an IntervalTimer.

src/newgrf_profiling.h

@@ -34,6 +34,8 @@ struct NewGRFProfiler {
 	void Abort();
 	std::string GetOutputFilename() const;
 
+	static void StartTimer(uint64 ticks);
+	static void AbortTimer();
 	static uint32 FinishAll();
 
 	/** Measurement of a single sprite group resolution */
@@ -56,6 +58,5 @@ struct NewGRFProfiler {
 };
 
 extern std::vector<NewGRFProfiler> _newgrf_profilers;
-extern TimerGameCalendar::Date _newgrf_profile_end_date;
 
 #endif /* NEWGRF_PROFILING_H */