Remove minimum requirement for C# version 7#26
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This changes means that C# v7 is no longer a minimum requirement
Add explicity variable declaration for the out variable. This changes means that C# v7 is no longer a minimum requirement
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Adding explicit variable declarations for an out variable, instead of declaring them in the method call means that C# version 7 is not a minimum requirement, and different version of msbuild can be used. So this PR improves backward compatibility with earlier C# versions.
"Starting with C# 7.0, you can declare the out variable in the argument list of the method call, rather than in a separate variable declaration. " - https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/out-parameter-modifier