Temperature: Remove generated arithmetic (BREAKING CHANGE)

See discussion in related issue. The semantics of the current Temperature
arithmetic is plain wrong, such as adding 1 + 1 degrees Celsius is not
2 degrees Celsius, but rather +275.15 degrees Celsius.

The problem is how we in speech mixi temperature delta/interval and temperature
measurements, in contrast to time (DateTime vs TimeSpan, with different units).

Refs #218
#218

Author: angularsen

UnitsNet.Tests/GeneratedCode/TemperatureTestsBase.g.cs

@@ -128,18 +128,6 @@ public void ConversionRoundTrip()
             Assert.AreEqual(1, Temperature.FromKelvins(kelvin.Kelvins).Kelvins, KelvinsTolerance);
         }
 
-        [Test]
-        public void ArithmeticOperators()
-        {
-            Temperature v = Temperature.FromKelvins(1);
-            Assert.AreEqual(-1, -v.Kelvins, KelvinsTolerance);
-            Assert.AreEqual(2, (Temperature.FromKelvins(3)-v).Kelvins, KelvinsTolerance);
-            Assert.AreEqual(2, (v + v).Kelvins, KelvinsTolerance);
-            Assert.AreEqual(10, (v*10).Kelvins, KelvinsTolerance);
-            Assert.AreEqual(10, (10*v).Kelvins, KelvinsTolerance);
-            Assert.AreEqual(2, (Temperature.FromKelvins(10)/5).Kelvins, KelvinsTolerance);
-            Assert.AreEqual(2, Temperature.FromKelvins(10)/Temperature.FromKelvins(5), KelvinsTolerance);
-        }
 
         [Test]
         public void ComparisonOperators()

UnitsNet/GeneratedCode/UnitClasses/Temperature.g.cs

@@ -465,47 +465,6 @@ public static string GetAbbreviation(TemperatureUnit unit, [CanBeNull] Culture c
 
         #endregion
 
-        #region Arithmetic Operators
-
-#if !WINDOWS_UWP
-        public static Temperature operator -(Temperature right)
-        {
-            return new Temperature(-right._kelvins);
-        }
-
-        public static Temperature operator +(Temperature left, Temperature right)
-        {
-            return new Temperature(left._kelvins + right._kelvins);
-        }
-
-        public static Temperature operator -(Temperature left, Temperature right)
-        {
-            return new Temperature(left._kelvins - right._kelvins);
-        }
-
-        public static Temperature operator *(double left, Temperature right)
-        {
-            return new Temperature(left*right._kelvins);
-        }
-
-        public static Temperature operator *(Temperature left, double right)
-        {
-            return new Temperature(left._kelvins*(double)right);
-        }
-
-        public static Temperature operator /(Temperature left, double right)
-        {
-            return new Temperature(left._kelvins/(double)right);
-        }
-
-        public static double operator /(Temperature left, Temperature right)
-        {
-            return Convert.ToDouble(left._kelvins/right._kelvins);
-        }
-#endif
-
-        #endregion
-
         #region Equality / IComparable
 
         public int CompareTo(object obj)

UnitsNet/Scripts/Include-GenerateUnitTestBaseClassSourceCode.ps1

@@ -113,7 +113,7 @@ namespace UnitsNet.Tests
         # Call another script function to generate logarithm-specific arithmetic operator test code.
         GenerateLogarithmicTestBaseClassSourceCode -className $className -baseUnitPluralName $baseUnitPluralName -unit $unit
     }
-    else {@"
+    elseif ($unitClass.GenerateArithmetic -eq $true) {@"
         [Test]
         public void ArithmeticOperators()
         {

UnitsNet/UnitDefinitions/Temperature.json

@@ -2,6 +2,7 @@
   "Name": "Temperature",
   "BaseUnit": "Kelvin",
   "XmlDoc": "A temperature is a numerical measure of hot or cold. Its measurement is by detection of heat radiation or particle velocity or kinetic energy, or by the bulk behavior of a thermometric material. It may be calibrated in any of various temperature scales, Celsius, Fahrenheit, Kelvin, etc. The fundamental physical definition of temperature is provided by thermodynamics.",
+  "GenerateArithmetic": false,
   "Units": [
     {
       "SingularName": "Kelvin",