Add option to include additional properties from projects in output

[TJPoorman]

We utilize specific properties from in each project to designate an alias for a kubernetes container when building through CI/CD.
This tool does almost everything we need with the exception of including those custom properties.

For example, we would retrieve the "ServiceName" property from this .csproj file:

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <ServiceName>MySuperCoolService</ServiceName>
    </PropertyGroup>
</Project>