Data: minor project cleanup

src/Data.Tests/Data.Tests.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GenerateProgramFile>false</GenerateProgramFile>
-    <TargetFrameworks>net461;netcoreapp2.2</TargetFrameworks>
+    <TargetFrameworks>net461;netcoreapp3.1</TargetFrameworks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <AssemblyName>MathNet.Numerics.Data.Tests</AssemblyName>
     <RootNamespace>MathNet.Numerics.Data.Tests</RootNamespace>
@@ -17,7 +17,6 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.Xml" />
-    <Content Include="app.config" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Data\Matlab\Matlab.csproj" />

src/Data/Matlab/Matlab.csproj

@@ -33,8 +33,5 @@ In addition to .Net 4.0 and newer now also targets .Net Standard 1.3 and 2.0.</P
     <Reference Include="System.Numerics" />
     <Reference Include="System.Runtime.Serialization" />
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Properties\" />
-  </ItemGroup>
   <Import Project="..\..\..\.paket\Paket.Restore.targets" />
 </Project>

src/Data/Text/Text.csproj

@@ -33,8 +33,5 @@ In addition to .Net 4.0 and newer now also targets .Net Standard 1.3 and 2.0.</P
     <Reference Include="System.Numerics" />
     <Reference Include="System.Runtime.Serialization" />
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Properties\" />
-  </ItemGroup>
   <Import Project="..\..\..\.paket\Paket.Restore.targets" />
 </Project>