Add ReciprocalArea (#955)

Added Reciprocal (Inverse) Area quantity and the corresponding units. Check this [link](https://en.wikipedia.org/wiki/Inverse-square_law) for further info. It is also used in fluid dynamics.

- Implemented for squaremeters, squareacentimeters, squareamillimeters, squarekilometers, squaredecimeters, SquareMicrometers, squaremiles, squareyards, squarefeet, squareInches and UsSurveySquareFeet. These units are selected to match with existing Area units.
-  Some arithmetic operator overloads are provided for Force, Area, Pressure and ReciprocalLength  to interact with the ReciprocalArea quantity for convenience
- Inverse method is implemented for Area quantity for convenience.

Co-authored-by: Andreas Gullberg Larsen <[email protected]>

Author: bc913

Common/UnitDefinitions/ReciprocalArea.json

@@ -0,0 +1,144 @@
+{
+  "Name": "ReciprocalArea",
+  "BaseUnit": "InverseSquareMeter",
+  "XmlDoc": "Reciprocal area (Inverse-square) quantity is used to specify a physical quantity inversely proportional to the square of the distance.",
+  "XmlDocRemarks": "https://en.wikipedia.org/wiki/Inverse-square_law",
+  "BaseDimensions": {
+    "L": -2
+  },
+  "Units": [
+    {
+      "SingularName": "InverseSquareMeter",
+      "PluralName": "InverseSquareMeters",
+      "FromUnitToBaseFunc": "x",
+      "FromBaseToUnitFunc": "x",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "m⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareKilometer",
+      "PluralName": "InverseSquareKilometers",
+      "FromUnitToBaseFunc": "x/1e6",
+      "FromBaseToUnitFunc": "x*1e6",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "km⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareDecimeter",
+      "PluralName": "InverseSquareDecimeters",
+      "FromUnitToBaseFunc": "x/1e-2",
+      "FromBaseToUnitFunc": "x*1e-2",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "dm⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareCentimeter",
+      "PluralName": "InverseSquareCentimeters",
+      "FromUnitToBaseFunc": "x/1e-4",
+      "FromBaseToUnitFunc": "x*1e-4",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "cm⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareMillimeter",
+      "PluralName": "InverseSquareMillimeters",
+      "FromUnitToBaseFunc": "x/1e-6",
+      "FromBaseToUnitFunc": "x*1e-6",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "mm⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareMicrometer",
+      "PluralName": "InverseSquareMicrometers",
+      "FromUnitToBaseFunc": "x/1e-12",
+      "FromBaseToUnitFunc": "x*1e-12",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "µm⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareMile",
+      "PluralName": "InverseSquareMiles",
+      "FromUnitToBaseFunc": "x/2.59e6",
+      "FromBaseToUnitFunc": "x*2.59e6",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "mi⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareYard",
+      "PluralName": "InverseSquareYards",
+      "FromUnitToBaseFunc": "x/0.836127",
+      "FromBaseToUnitFunc": "x*0.836127",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "yd⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareFoot",
+      "PluralName": "InverseSquareFeet",
+      "FromUnitToBaseFunc": "x/0.092903",
+      "FromBaseToUnitFunc": "x*0.092903",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "ft⁻²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseUsSurveySquareFoot",
+      "PluralName": "InverseUsSurveySquareFeet",
+      "FromUnitToBaseFunc": "x/0.09290341161",
+      "FromBaseToUnitFunc": "x*0.09290341161",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "ft⁻² (US)" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "InverseSquareInch",
+      "PluralName": "InverseSquareInches",
+      "FromUnitToBaseFunc": "x/0.00064516",
+      "FromBaseToUnitFunc": "x*0.00064516",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "in⁻²" ]
+        }
+      ]
+    }
+  ]
+}
+