Add Nuget packages for all dependencies

OpenRA.Server/OpenRA.Server.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net461</TargetFramework>
+    <TargetFramework>net472</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Optimize>true</Optimize>
     <UseVSHostingProcess>false</UseVSHostingProcess>
@@ -14,7 +14,7 @@
     <ExternalConsole>false</ExternalConsole>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <CodeAnalysisRuleSet>..\OpenRA.ruleset</CodeAnalysisRuleSet>
-    <Configurations>Release;Debug;Release-x86</Configurations>
+    <Configurations>Release;Debug</Configurations>
     <ManagedExeLauncher Condition="('$(OS)' != 'Windows_NT')">mono </ManagedExeLauncher>
   </PropertyGroup>
   <ItemGroup>
@@ -25,7 +25,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <Optimize>false</Optimize>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)' == 'Release-x86'">
+  <PropertyGroup Condition="'$(TargetPlatform)' == 'win-x86'">
     <Prefer32bit>true</Prefer32bit>
   </PropertyGroup>
   <ItemGroup>
@@ -34,6 +34,7 @@
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
     </ProjectReference>
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118" />
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
     <AdditionalFiles Include="../stylecop.json" />
   </ItemGroup>
   <Target Name="DisableAnalyzers" BeforeTargets="CoreCompile" Condition="'$(Configuration)'=='Release'">
@@ -46,4 +47,4 @@
     <Exec Command="$(ManagedExeLauncher)&quot;$(TargetDir)OpenRA.PostProcess.exe&quot; &quot;$(TargetPath)&quot; -LAA" />
     <Touch Files="$(IntermediateOutputPath)\$(TargetFileName).processed" AlwaysCreate="true" />
   </Target>
-</Project>
+</Project>