* Move to PlatformToolset variable
* Workaround for MSBuild issue in vs2019 16.10
* Apologies for Windows line endings, appears like original file had Unix line-endings
* Consolidate msbuild and test logic into separate batch files, so helper scripts don't need to duplicate too much.
* Use tools\vcvars.cmd, rather than directly linking against the VS2017 cmd.
* Add the ability to specifiy custom properties to RunMsBuild.bat
* Move build-all.bat to use RunMsBuild.bat, remove references to non-existant vcvars-ext.bat