Add radioactivity (#1345)

Added Radioactivity (radioactive decay), along with three units: 
Bq - Becquerel (SI-derived)
Ci - Curie (non-SI)
Rd - Rutherford (non-SI)

The scope of prefixes is fairly wide (Pico- to Exa- for Becquerel ,
Pico- to Tera- for Curie and Rutherford) in order to support most common
scenarios, like measuring concentration of radioactive elements in a
substance (e.g. 10 Bq per m3 of air is considered normal), rate of
radioactive decay in electrical parts, Geiger counter scales, cosmic ray
interactions or even global inventory of specific radioactive elements
(per [Wikipedia](https://en.wikipedia.org/wiki/Becquerel#Examples)). It
does not, however, support prefixes for things like activity produced by
[nuclear explosions](https://books.google.pl/books?id=CJqcq2C792UC&pg=PA74&redir_esc=y#v=onepage&q=hiroshima&f=false)
(values beyond 10^24 Bq), since this seems too niche even for C# devs.

Similar PR was already created a quople years back
(#915), but it was never
actually merged.

---------

Co-authored-by: Piotr Stenke <piotr.stenke@nexpertis.pl>

Author: piotrstenke

Common/UnitDefinitions/Radioactivity.json

@@ -0,0 +1,75 @@
+{
+  "Name": "Radioactivity",
+  "BaseUnit": "Becquerel",
+  "XmlDocSummary": "Amount of ionizing radiation released when an element spontaneously emits energy as a result of the radioactive decay of an unstable atom per unit time.",
+  "XmlDocsRemarks": "https://en.wikipedia.org/wiki/Radioactive_decay",
+  "BaseDimensions": {
+    "T": -1
+  },
+  "Units": [
+    {
+      "SingularName": "Becquerel",
+      "PluralName": "Becquerels",
+      "FromUnitToBaseFunc": "{x}",
+      "FromBaseToUnitFunc": "{x}",
+      "BaseUnits": {
+        "T": "Second"
+      },
+      "XmlDocSummary": "Activity of a quantity of radioactive material in which one nucleus decays per second.",
+      "XmlDocsRemarks": "https://en.wikipedia.org/wiki/Becquerel",
+      "Prefixes": [ "Pico", "Nano", "Micro", "Milli", "Kilo", "Mega", "Giga", "Tera", "Peta", "Exa" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "Bq" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "Бк" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "Curie",
+      "PluralName": "Curies",
+      "FromUnitToBaseFunc": "{x} * 3.7e10",
+      "FromBaseToUnitFunc": "{x} / 3.7e10",
+      "BaseUnits": {
+        "T": "Second"
+      },
+      "Prefixes": [ "Pico", "Nano", "Micro", "Milli", "Kilo", "Mega", "Giga", "Tera" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "Ci" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "Ки" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "Rutherford",
+      "PluralName": "Rutherfords",
+      "FromUnitToBaseFunc": "{x} * 1e6",
+      "FromBaseToUnitFunc": "{x} / 1e6",
+      "BaseUnits": {
+        "T": "Second"
+      },
+      "XmlDocSummary": "Activity of a quantity of radioactive material in which one million nuclei decay per second.",
+      "XmlDocsRemarks": "https://en.wikipedia.org/wiki/Rutherford_(unit)",
+      "Prefixes": [ "Pico", "Nano", "Micro", "Milli", "Kilo", "Mega", "Giga", "Tera" ],
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "Rd" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "Рд" ]
+        }
+      ]
+    }
+  ]
+}

Common/UnitEnumValues.g.json

@@ -1794,5 +1794,36 @@
   "Molality": {
     "MolePerGram": 4,
     "MolePerKilogram": 1
+  },
+  "Radioactivity": {
+    "Becquerel": 7,
+    "Curie": 9,
+    "Exabecquerel": 10,
+    "Gigabecquerel": 4,
+    "Gigacurie": 5,
+    "Gigarutherford": 1,
+    "Kilobecquerel": 6,
+    "Kilocurie": 8,
+    "Kilorutherford": 2,
+    "Megabecquerel": 3,
+    "Megacurie": 20,
+    "Megarutherford": 13,
+    "Microbecquerel": 19,
+    "Microcurie": 15,
+    "Microrutherford": 14,
+    "Millibecquerel": 17,
+    "Millicurie": 18,
+    "Millirutherford": 12,
+    "Nanobecquerel": 16,
+    "Nanocurie": 11,
+    "Nanorutherford": 27,
+    "Petabecquerel": 21,
+    "Rutherford": 28,
+    "Terabecquerel": 23,
+    "Teracurie": 29,
+    "Terarutherford": 22,
+    "Picobecquerel": 36,
+    "Picocurie": 35,
+    "Picorutherford": 25
   }
 }