v.2.7.1.1
-Adds ability to get Equinox and Solstice information Issue 144.
-Adds Solstice/Equinox eager loading extension specification (to turn off new feature and save on performance).
-Fixes bug with "TryParse" throwing exceptions under certain conditions Issue 146.
-Fixes .NET Core 3.X specific round-tripping issue Issue 147.
-Fixes MGRS eager loading specification issues Issue 148 and Issue 150.
Solstice Example
Coordinate c = new Coordinate(45,112, new DateTime(2020,3,6));
Console.WriteLine(c.CelestialInfo.Solstices.Summer);//20-Jun-2020 21:44 (UTC)