merged upstream & fixed issues with nullable ref types

- merged all upstream modifications
- fixed nullability issues in UnitSystem
- the Lazy<..> BaseUnits constructor was made protected
- marked all tests that rely solely on BaseUnits as Obsolete (with error=false)
- removed some obsolete tests from MassConcentration (tesing for default unit system units)

Author: lipchev

.github/workflows/automerge.yml

@@ -260,4 +260,3 @@ Artifacts
 /secure-file
 /Tools/reportgenerator.exe
 /Tools/.store/
-codecov.sh

.gitignore

@@ -7,7 +7,7 @@ $nuget = "$root\Tools\NuGet.exe"
 $vswhere = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
 $msbuild = & $vswhere -latest -products * -requires Microsoft.Component.MSBuild -property installationPath
 if ($msbuild) {
-  $msbuild = join-path $msbuild 'MSBuild\15.0\Bin\MSBuild.exe'
+  $msbuild = join-path $msbuild 'MSBuild\Current\Bin\MSBuild.exe'
 }
 
 function Remove-ArtifactsDir {
@@ -60,6 +60,7 @@ function Start-Build([boolean] $IncludeWindowsRuntimeComponent = $false) {
 function Start-Tests {
   $projectPaths = @(
     "UnitsNet.Tests\UnitsNet.Tests.csproj",
+    "UnitsNet.NumberExtensions.Tests\UnitsNet.NumberExtensions.Tests.csproj",
     "UnitsNet.Serialization.JsonNet.Tests\UnitsNet.Serialization.JsonNet.Tests.csproj",
     "UnitsNet.Serialization.JsonNet.CompatibilityTests\UnitsNet.Serialization.JsonNet.CompatibilityTests.csproj"
     )
@@ -97,7 +98,8 @@ function Start-Tests {
 function Start-PackNugets {
   $projectPaths = @(
     "UnitsNet\UnitsNet.csproj",
-    "UnitsNet.Serialization.JsonNet\UnitsNet.Serialization.JsonNet.csproj"
+    "UnitsNet.Serialization.JsonNet\UnitsNet.Serialization.JsonNet.csproj",
+    "UnitsNet.NumberExtensions\UnitsNet.NumberExtensions.csproj"
     )
 
   write-host -foreground blue "Pack nugets...`n---"

Build/build-functions.psm1

@@ -1,4 +1,5 @@
 @echo off
 SET scriptdir=%~dp0
 call powershell -NoProfile %scriptdir%\set-version-UnitsNet.ps1 -bump major
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump major
 if %errorlevel% neq 0 exit /b %errorlevel%

Build/bump-version-UnitsNet-major.bat

@@ -1,4 +1,5 @@
 @echo off
 SET scriptdir=%~dp0
 call powershell -NoProfile %scriptdir%\set-version-UnitsNet.ps1 -bump minor
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump minor
 if %errorlevel% neq 0 exit /b %errorlevel%

Build/bump-version-UnitsNet-minor.bat

@@ -1,4 +1,5 @@
 @echo off
 SET scriptdir=%~dp0
 call powershell -NoProfile %scriptdir%\set-version-UnitsNet.ps1 -bump patch
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump patch
 if %errorlevel% neq 0 exit /b %errorlevel%

Build/bump-version-UnitsNet-patch.bat

@@ -1,4 +1,5 @@
 @echo off
 SET scriptdir=%~dp0
 call powershell -NoProfile %scriptdir%\set-version-UnitsNet.ps1 -bump suffix
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump suffix
 if %errorlevel% neq 0 exit /b %errorlevel%

Build/bump-version-UnitsNet-suffix.bat

@@ -0,0 +1,4 @@
+@echo off
+SET scriptdir=%~dp0
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump major
+if %errorlevel% neq 0 exit /b %errorlevel%

Build/bump-version-UnitsNet.NumberExtensions-major.bat

@@ -0,0 +1,4 @@
+@echo off
+SET scriptdir=%~dp0
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump minor
+if %errorlevel% neq 0 exit /b %errorlevel%

Build/bump-version-UnitsNet.NumberExtensions-minor.bat

@@ -0,0 +1,4 @@
+@echo off
+SET scriptdir=%~dp0
+call powershell -NoProfile %scriptdir%\set-version-UnitsNet.NumberExtensions.ps1 -bump patch
+if %errorlevel% neq 0 exit /b %errorlevel%