Add additional LinearDensity units (more SI combinations and lb/in) (#759)

* Add LinerDensity additional units (ug/mm, ug/cm, ug/m, mg/mm, mg/cm, mg/m, g/mm, g/cm, kg/mm, lb/in)

Author: trb5016

Common/UnitDefinitions/LinearDensity.json

@@ -8,19 +8,57 @@
     "M": 1
   },
   "Units": [
+    {
+      "SingularName": "GramPerMillimeter",
+      "PluralName": "GramsPerMillimeter",
+      "FromUnitToBaseFunc": "x",
+      "FromBaseToUnitFunc": "x",
+      "Prefixes": [ "Micro", "Milli", "Kilo" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "g/mm" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "GramPerCentimeter",
+      "PluralName": "GramsPerCentimeter",
+      "FromUnitToBaseFunc": "x*1e-1",
+      "FromBaseToUnitFunc": "x/1e-1",
+      "Prefixes": [ "Micro", "Milli", "Kilo" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "g/cm" ]
+        }
+      ]
+    },
     {
       "SingularName": "GramPerMeter",
       "PluralName": "GramsPerMeter",
       "FromUnitToBaseFunc": "x*1e-3",
       "FromBaseToUnitFunc": "x/1e-3",
-      "Prefixes": [ "Kilo" ],
+      "Prefixes": [ "Micro", "Milli", "Kilo" ],
       "Localization": [
         {
           "Culture": "en-US",
           "Abbreviations": [ "g/m" ]
         }
       ]
     },
+    {
+      "SingularName": "PoundPerInch",
+      "PluralName": "PoundsPerInch",
+      "FromUnitToBaseFunc": "x/5.5997415e-2",
+      "FromBaseToUnitFunc": "x*5.5997415e-2",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "lb/in" ]
+        }
+      ]
+    },
     {
       "SingularName": "PoundPerFoot",
       "PluralName": "PoundsPerFoot",

UnitsNet.NumberExtensions.Tests/GeneratedCode/NumberToLinearDensityExtensionsTest.g.cs

@@ -27,8 +27,26 @@ namespace UnitsNet.Tests.CustomCode
 {
     public class LinearDensityTests : LinearDensityTestsBase
     {
+
+        protected override double MicrogramsPerMillimeterInOneKilogramPerMeter => 1e6;
+        protected override double MicrogramsPerCentimeterInOneKilogramPerMeter => 1e7;
+        protected override double MicrogramsPerMeterInOneKilogramPerMeter => 1e9;        
+
+        protected override double MilligramsPerMillimeterInOneKilogramPerMeter => 1e3;
+        protected override double MilligramsPerCentimeterInOneKilogramPerMeter => 1e4;
+        protected override double MilligramsPerMeterInOneKilogramPerMeter => 1e6;
+
+        protected override double GramsPerCentimeterInOneKilogramPerMeter => 1e1;
         protected override double GramsPerMeterInOneKilogramPerMeter => 1e3;
+        protected override double GramsPerMillimeterInOneKilogramPerMeter => 1;
+
+        protected override double KilogramsPerCentimeterInOneKilogramPerMeter => 1e-2;
         protected override double KilogramsPerMeterInOneKilogramPerMeter => 1;
+        protected override double KilogramsPerMillimeterInOneKilogramPerMeter => 1e-3;
+
+        protected override double PoundsPerInchInOneKilogramPerMeter => 5.599741459E-02;
+
         protected override double PoundsPerFootInOneKilogramPerMeter => 6.71968975e-1;
+        
     }
 }