Adding the GitVersion msbuild task package.

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Switching from GitVersion to GitHubFlowVersion because there are some issues with GitVersion picking up the tags in the correct way

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Adding the inline MsBuild task to get the Semantic Version via the GitHubFlowVersion json output file.

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Switching the build of the binaries to use the semantic version.

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Removing unnecessary version information from the PrepareWorkspace script

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Switching NuGet to use the semantic version number

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Removing the old version.xml file and replacing it with the new NextVersion text file

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