Davis added support for VersionTools to be able to pull from a local
filesystem layout that looks like what we have in GitHub on
dotnet/versions.
Start to consume this so a composed build can use this logic to update
dependencies using local version information produced during the build.
- Fix build issues due to .props file not existing on a clean
enlistment
- Fix path separator issues on *NIX
- Add update-dependencies.sh
- Support -Update in update-dependencies.ps1
- Take the latest VersionTools, so we can take advantage of new features.
- Update what files need to be updated - DependencyVersions.props.
- Clean up the powershell script.