Add LinearDensity.GramPerFoot and prefixes (#1392)

Author: filusma

Common/UnitDefinitions/LinearDensity.json

@@ -70,6 +70,19 @@
           "Abbreviations": [ "lb/ft" ]
         }
       ]
+    },
+    {
+      "SingularName": "GramPerFoot",
+      "PluralName": "GramsPerFoot",
+      "FromUnitToBaseFunc": "{x} * ( 1e-3 / 0.3048 )",
+      "FromBaseToUnitFunc": "{x} / ( 1e-3 / 0.3048 )",
+      "Prefixes": [ "Micro", "Milli", "Kilo" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "g/ft" ]
+        }
+      ]
     }
   ]
 }

Common/UnitEnumValues.g.json

@@ -724,7 +724,11 @@
     "MilligramPerMeter": 11,
     "MilligramPerMillimeter": 12,
     "PoundPerFoot": 13,
-    "PoundPerInch": 14
+    "PoundPerInch": 14,
+    "GramPerFoot": 22,
+    "KilogramPerFoot": 19,
+    "MicrogramPerFoot": 20,
+    "MilligramPerFoot": 18
   },
   "LinearPowerDensity": {
     "GigawattPerCentimeter": 1,

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

@@ -46,6 +46,11 @@ public class LinearDensityTests : LinearDensityTestsBase
         protected override double KilogramsPerMeterInOneKilogramPerMeter => 1;
         protected override double KilogramsPerMillimeterInOneKilogramPerMeter => 1e-3;
 
+        protected override double MicrogramsPerFootInOneKilogramPerMeter => 3.048e8;
+        protected override double MilligramsPerFootInOneKilogramPerMeter => 3.048e5;
+        protected override double GramsPerFootInOneKilogramPerMeter => 3.048e2;
+        protected override double KilogramsPerFootInOneKilogramPerMeter => 3.048e-1;
+
         protected override double PoundsPerInchInOneKilogramPerMeter => 5.599741459E-02;
 
         protected override double PoundsPerFootInOneKilogramPerMeter => 6.71968975e-1;