Use Newtonsoft.Json from game instead of nuget

Author: michael-r-elp

MultiplayerCore/MultiplayerCore.csproj

@@ -90,6 +90,11 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>$(BeatSaberDir)\Beat Saber_Data\Managed\Newtonsoft.Json.dll</HintPath>
+      <Private>False</Private>
+      <SpecificVersion>False</SpecificVersion>
+    </Reference>
     <Reference Include="AdditionalContentModel.Interfaces">
       <HintPath>$(BeatSaberDir)\Beat Saber_Data\Managed\AdditionalContentModel.Interfaces.dll</HintPath>
       <Private>False</Private>
@@ -331,7 +336,6 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
   <Target Name="PreBuild" BeforeTargets="BeforeBuild" Condition="'$(NCRUNCH)' != '1'">
     <Error Text="The BeatSaberModdingTools.Tasks nuget package doesn't seem to be installed." Condition="'$(BSMTTaskAssembly)' == ''" />