Add Kilo prefix to yards (#1339)

Add a "kilo" prefix to yards (similar to kilofeet). 1kyd = 1000yd.

See the bottom paragraph of [this Wikipedia article](https://en.wikipedia.org/wiki/Metrication_in_the_United_States#Hybrid_units) for an example of where this is practically used.

Author: jmnauman

Common/UnitDefinitions/Length.json

@@ -63,6 +63,7 @@
       },
       "FromUnitToBaseFunc": "{x} * 0.9144",
       "FromBaseToUnitFunc": "{x} / 0.9144",
+      "Prefixes":  [ "Kilo" ],
       "XmlDocSummary": "The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet (or 36 inches). Since 1959 the yard has been by international agreement standardized as exactly 0.9144 meter. A distance of 1,760 yards is equal to 1 mile.",
       "XmlDocRemarks": "https://en.wikipedia.org/wiki/Yard",
       "Localization": [

Common/UnitEnumValues.g.json

@@ -701,7 +701,8 @@
     "Kilofoot": 45,
     "Femtometer": 48,
     "Picometer": 43,
-    "Gigameter": 44
+    "Gigameter": 44,
+    "Kiloyard": 38
   },
   "Level": {
     "Decibel": 1,

UnitsNet.NanoFramework/GeneratedCode/Quantities/Length.g.cs

@@ -67,6 +67,8 @@ public class LengthTests : LengthTestsBase
 
         protected override double KiloparsecsInOneMeter => 3.2407790389471100000000000E-20;
 
+        protected override double KiloyardsInOneMeter => 1.0936132983E-3;
+
         protected override double LightYearsInOneMeter => 1.0570008340247000000000000E-16;
 
         protected override double MegalightYearsInOneMeter => 1.0570008340247000000000000E-22;