Batcave

- Added
- Added extra_vars argument to build.ConfigurationBuilder.

- Changed
- Update pypiwin32 to 222.
- Update PyQt5 to 5.10.
- Changed the repo reference file name.
- Always publish repo references in artifacts directory for Docker builds.

- Removed
- Removed slacker dependency.
- Removed obsolete static variable.

- Added
- Added support for Docker images push to Google Cloud registry.

- Changed
- Fixed build.VisualStudioApplication to work with MSBuildBuilder changes.

- Added
- Added netutil.download.
- Added support for enabling/disabling system services.
- Added to sysutil: create_user, create_groups.

- Changed
- Replace sysutil.chmodtree with chmod/chown with recursive parameter.
- Make Cmd driver processing case-sensitive.
- Update sysutl.syscmd to take command, arg1, arg2 rather than cmdspec.
- Updated internal version number to three digits.
- Fixed error with unpacking compressed tar files.
- Update setuptools to 38.4.0.

- Added
- Improved MSTest support.
- Build completed successfully message.

- Changed
- Update default version file for webapp project type.
- Update setuptools to 38.2.4.
- Update virtualwrapper-win to 1.2.5.
- Update GitPython to 2.1.8.
- Update cx_Freeze to 5.1.1.