Add VolumePerLength (#604)

* Add base units except for OilBarrelPerFoot

I have no idea what base unit to put for that.

Author: adelmoral

Common/UnitDefinitions/VolumePerLength.json

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+{
+  "Name": "VolumePerLength",
+  "BaseUnit": "CubicMeterPerMeter",
+  "XmlDoc": "Volume, typically of fluid, that a container can hold within a unit of length.",
+  "BaseDimensions": {
+    "L": 3
+  },
+  "Units": [
+    {
+      "SingularName": "CubicMeterPerMeter",
+      "PluralName": "CubicMetersPerMeter",
+      "BaseUnits": {
+        "L": "Meter"
+      },
+      "FromUnitToBaseFunc": "x",
+      "FromBaseToUnitFunc": "x",
+      "Prefixes": [],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "m³/m" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "LiterPerMeter",
+      "PluralName": "LitersPerMeter",
+      "BaseUnits": {
+        "L": "Decimeter"
+      },
+      "FromUnitToBaseFunc": "x/1000",
+      "FromBaseToUnitFunc": "x*1000",
+      "Prefixes": [],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "l/m" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "OilBarrelPerFoot",
+      "PluralName": "OilBarrelsPerFoot",
+      "FromUnitToBaseFunc": "x/1.91713408",
+      "FromBaseToUnitFunc": "x*1.91713408",
+      "Prefixes": [],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "bbl/ft" ]
+        }
+      ]
+    }
+  ]
+}

UnitsNet.Tests/CustomCode/VolumePerLengthTests.cs

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+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated (once) by \generate-code.bat, but will not be
+//     regenerated when it already exists. The purpose of creating this file is to make
+//     it easier to remember to implement all the unit conversion test cases.
+//
+//     Whenever a new unit is added to this quantity and \generate-code.bat is run,
+//     the base test class will get a new abstract property and cause a compile error
+//     in this derived class, reminding the developer to implement the test case
+//     for the new unit.
+//
+//     See https://github.com/angularsen/UnitsNet/wiki/Adding-a-New-Unit for how to add or edit units.
+//
+//     Add CustomCode\Quantities\MyQuantity.extra.cs files to add code to generated quantities.
+//     Add UnitDefinitions\MyQuantity.json and run generate-code.bat to generate new units or quantities.
+//
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Tests.CustomCode
+{
+    public class VolumePerLengthTests : VolumePerLengthTestsBase
+    {
+        // Override properties in base class here
+        protected override double CubicMetersPerMeterInOneCubicMeterPerMeter => 1;
+
+        protected override double LitersPerMeterInOneCubicMeterPerMeter => 1000;
+
+        protected override double OilBarrelsPerFootInOneCubicMeterPerMeter => 1.917134088;
+    }
+}