Adding the MsBuild inline task for getting the semantic version.

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

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Removing unused references to the version number and the version.xml file

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Fixing up the packaging build scripts to use the semantic version. Using the short semantic version for NuGet and the full semantic version for the verification scripts.

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Replacing version.xml with NextVersion.txt

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Merge pull request #44 from pvandervelde/issue/semanticversioning

Switch versioning scheme to use Semantic Versioning