Support loading and saving fsproj with msbuild properties. #85
Description
Example usage of properties: Microsoft/visualfsharp:src/buildfromsource/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj@master
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Example usage of properties: Microsoft/visualfsharp:src/buildfromsource/FSharp.Compiler.Private/FSharp.Compiler.Private.fsproj@master