* Enable building MSI, zip and nuget packages when Py_OutDir is set.

* Restore the --build option, which got reverted at some point.

* Ensure output directory is created.

* Enables BuildForDaily and DailyBuildVersion options for nuget package.

Updates ssl and tkinter projects to use pre-built externals

* Fixes build scripts to find msbuild.exe and stop relying on vcvarsall.bat
Also fixes bdist_wininst.vcxproj to use correct version in generated name.

The Windows build now depends on Python 3.6 to fetch externals, but it will be downloaded via NuGet (which is downloaded via PowerShell) if it is not available via `py -3.6`.  This means the only thing that must be installed on a modern Windows box to do a full build of CPython with all extensions is Visual Studio.

Also fixes an outdated note about _lzma in PCbuild/readme.txt

Updates checked-in line endings on several files.

Make also minor PEP8 coding style fixes on modified imports.

* bpo-27593: Updates Windows build to use information from git