Feature Request: Add Oficial Twilight on Calendar integration.

[Efrenczm]

Thanks for your work.

[nognkantoor]

The export to calendar offers:

• Astronomical Twilight
• Nautical Twilight;
• Civil Twilight;
• Sundown/Sunup

What other Twilight are you requesting be added to the calendar?

The program currently offers:

• Golden Hour?
• Blue Hour? As such, export to calendar should be straightforward.

Depending upon context, any and all of the following can also be defined as official twilight:

• Candle Lighting Times;
• Three Stars Visible Times;
• Fajir Angle;
• Isha Angle;
• Matins;
• Lauds;

I think that there is an API that allows third parties to create additional modules which add functionality, such as the times used by those twilights, to be added to either Suntimes to SunTimes.Calendar.

I'll just note that each of those religious twilight periods have at least two, and as many as 60 different criteria, by which the correct time is determined.