Added kilopound-force imperial variant to force (#747)

Author: dschuermans

Common/UnitDefinitions/Force.json

@@ -147,6 +147,22 @@
           "Abbreviations": [ "ozf" ]
         }
       ]
+    },
+    {
+      "SingularName": "KilopoundForce",
+      "PluralName": "KilopoundsForce",
+      "FromUnitToBaseFunc": "x*4448.2216152605095551842641431421",
+      "FromBaseToUnitFunc": "x/4448.2216152605095551842641431421",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "kipf" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "кипф" ]
+        }
+      ]
     }
   ]
 }

UnitsNet.Tests/CustomCode/ForceTests.cs

@@ -12,6 +12,7 @@ public class ForceTests : ForceTestsBase
 
         protected override double KilogramsForceInOneNewton => 0.101972;
 
+        protected override double KilopoundsForceInOneNewton => 0.22481e-3;
         protected override double MeganewtonsInOneNewton => 1E-6;
         protected override double KilonewtonsInOneNewton => 1E-3;