Added Megameter (1e+6 meters) (#1208)

* Added Megameter (1e+6 meters)

Megameter is a useful intermediate unit between kilometer and light second

Use cases tend towards astronomical such as satellite orbits

* Removed Megameter direct definition; added Mega prefix to Meter

---------

Co-authored-by: McSquizzy <mcsquizzy.swglegends@gmail.com>

Author: Mando501

Common/UnitDefinitions/Length.json

@@ -14,7 +14,7 @@
       },
       "FromUnitToBaseFunc": "{x}",
       "FromBaseToUnitFunc": "{x}",
-      "Prefixes": [ "Nano", "Micro", "Milli", "Centi", "Deci", "Deca", "Hecto", "Kilo" ],
+      "Prefixes": [ "Nano", "Micro", "Milli", "Centi", "Deci", "Deca", "Hecto", "Kilo", "Mega" ],
       "Localization": [
         {
           "Culture": "en-US",

Common/UnitEnumValues.g.json

@@ -678,7 +678,8 @@
     "SolarRadius": 33,
     "Twip": 34,
     "UsSurveyFoot": 35,
-    "Yard": 36
+    "Yard": 36,
+    "Megameter": 41
   },
   "Level": {
     "Decibel": 1,

UnitsNet.NanoFramework/GeneratedCode/Quantities/Length.g.cs

@@ -82,6 +82,8 @@ public class LengthTests : LengthTestsBase
 
         protected override double DataMilesInOneMeter => 0.000546807;
 
+        protected override double MegametersInOneMeter => 1e-6;
+
         [ Fact]
         public void AreaTimesLengthEqualsVolume()
         {