Python 3.7.5 support

This release includes the following changes:

• Move from Python 3.6.4 to Python 3.7.5
• Include latest versions of tcl/tk
• Include libraries and modules needed for pip, ensurepip and venv

Python3.6 specific files.

Previous versions used 32bit 3.7 files. These don't work with 3.6. We need to differentiate between versions.

With corrected zip files

Now the automation script is written, update the layout of the zip files.

Initial release

Initial release for testing purposes.