Add MillidegreeCelsius and add prefixes to TemperatureDelta

Common/UnitDefinitions/Temperature.json

@@ -37,6 +37,21 @@
         }
       ]
     },
+    {
+      "SingularName": "MillidegreeCelsius",
+      "PluralName": "MillidegreesCelsius",
+      "BaseUnits": {
+        "Θ": "DegreeCelsius"
+      },
+      "FromUnitToBaseFunc": "x / 1000 + 273.15",
+      "FromBaseToUnitFunc": "(x - 273.15) * 1000",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "m°C" ]
+        }
+      ]
+    },
     {
       "SingularName": "DegreeDelisle",
       "PluralName": "DegreesDelisle",

Common/UnitDefinitions/TemperatureDelta.json

@@ -20,6 +20,7 @@
       "PluralName": "DegreesCelsius",
       "FromUnitToBaseFunc": "x",
       "FromBaseToUnitFunc": "x",
+      "Prefixes": [ "Nano", "Micro", "Milli", "Centi", "Deci", "Hecto", "Kilo" ],
       "Localization": [
         {
           "Culture": "en-US",

UnitsNet.Tests/CustomCode/TemperatureDeltaTests.cs

@@ -26,14 +26,21 @@ namespace UnitsNet.Tests.CustomCode
 {
     public class TemperatureDeltaTests : TemperatureDeltaTestsBase
     {
+        protected override double CentidegreesCelsiusInOneKelvin => 100;
+        protected override double DecidegreesCelsiusInOneKelvin => 10;
         protected override double DegreesCelsiusInOneKelvin => 1;
         protected override double DegreesDelisleInOneKelvin => -1.5d;
         protected override double DegreesFahrenheitInOneKelvin => 1.8;
         protected override double DegreesNewtonInOneKelvin => 0.33d;
         protected override double DegreesRankineInOneKelvin => 1.8;
         protected override double DegreesReaumurInOneKelvin => 0.8;
         protected override double DegreesRoemerInOneKelvin => 21 / 40d;
+        protected override double HectodegreesCelsiusInOneKelvin => 1E-2;
         protected override double KelvinsInOneKelvin => 1;
+        protected override double KilodegreesCelsiusInOneKelvin => 1E-3;
+        protected override double MicrodegreesCelsiusInOneKelvin => 1E6;
+        protected override double MillidegreesCelsiusInOneKelvin => 1E3;
+        protected override double NanodegreesCelsiusInOneKelvin => 1E9;
 
         [Fact]
         public void TemperatureDeltaTimesSpecificEntropyEqualsSpecificEnergy()

UnitsNet.Tests/CustomCode/TemperatureTests.cs

@@ -25,6 +25,8 @@ public class TemperatureTests : TemperatureTestsBase
 
         protected override double KelvinsInOneKelvin => 1;
 
+        protected override double MillidegreesCelsiusInOneKelvin => -272150;
+
         protected override double SolarTemperaturesInOneKelvin => 1.73070266528210E-04;
 
         public static IEnumerable<object[]> DividedByTemperatureDeltaEqualsTemperatureData { get; } =