Deprecate MaxValue, MinValue (#884)

Author: angularsen

CodeGen/Generators/UnitsNetGen/QuantityGenerator.cs

@@ -233,11 +233,13 @@ private void GenerateStaticProperties()
         /// <summary>
         /// Represents the largest possible value of {_quantity.Name}
         /// </summary>
+        [Obsolete(""MaxValue and MinValue will be removed. Choose your own value or use nullability for unbounded lower/upper range checks. See discussion in https://github.com/angularsen/UnitsNet/issues/848."")]
         public static {_quantity.Name} MaxValue {{ get; }} = new {_quantity.Name}({_valueType}.MaxValue, BaseUnit);
 
         /// <summary>
         /// Represents the smallest possible value of {_quantity.Name}
         /// </summary>
+        [Obsolete(""MaxValue and MinValue will be removed. Choose your own value or use nullability for unbounded lower/upper range checks. See discussion in https://github.com/angularsen/UnitsNet/issues/848."")]
         public static {_quantity.Name} MinValue {{ get; }} = new {_quantity.Name}({_valueType}.MinValue, BaseUnit);
 
         /// <summary>