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Proj0031: Adopt preferred casing of nodes

MS Build is (mostly) case insensitive. For project files, that means that the root node (<Project>) and its child nodes (such as <PropertyGroup> and <ItemGroup>) are case sensitive, but their ancestors are not. To prevent issues, however, it is preferred to use the same casing consistently.

Non-compliant

<Project Sdk="Microsoft.NET.Sdk">

  <Import Project="../props/simple.props" />
  
  <PropertyGroup>
    <TARGETFRAMEWORK>net8.0</TARGETFRAMEWORK>
  </PropertyGroup>

  <ItemGroup>
    <ComPile Include="../common/Code.cs" />
  </ItemGroup>

  <ItemGroup>
    <packagereference Include="Qowaiv" Version="7.1.3" />
  </ItemGroup>
  
</Project>

Compliant

<Project Sdk="Microsoft.NET.Sdk">

  <Import Project="../props/simple.props" />
  
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <Compile Include="../common/Code.cs" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Qowaiv" Version="7.1.3" />
  </ItemGroup>
  
</Project>

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