Allow Fornax.Core to use FSharp.Core 6.0.7 or newer (#129)

instead of pinning it to the version needed by the FCS build used in the CLI tool

Author: Numpsy

Directory.Packages.props

@@ -3,6 +3,8 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <RestorePackagesWithLockFile>false</RestorePackagesWithLockFile>
     <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
+    <!-- Fornax.Core doesn't use FCS, so we don't need to pin FSharp.Core to a matching version -->
+    <FornaxCoreFSharpCoreVersion>6.0.7</FornaxCoreFSharpCoreVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="FSharp.Core" Version="[8.0.100]" />

src/Fornax.Core/Fornax.Core.fsproj

@@ -9,6 +9,6 @@
     <Compile Include="Model.fs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="FSharp.Core" />
+    <PackageReference Include="FSharp.Core" VersionOverride="$(FornaxCoreFSharpCoreVersion)" />
   </ItemGroup>
 </Project>