Update dependencies for Python 3

[LeonarddeR]

Link to issue number:

This pr depends on the following child pull requests.

• Add py2exe 0.9.3.1 commit 786c4d3 py2exe-bin#1
• Populate repository with comtypes 1.1.7 comtypes-bin#1
• Update wx to Python 3 version wxPython-bin#1
• Remove py2exe and pywin32 dependencies from miscdeps nvda-misc-deps#11

Summary of the issue:

NVDA includes git submodules from several sources. In the current situation, the py2exe packages is bundled inside the nvda-misc-deps repository. It was discussed with @feerrenrut an decided that we wanted to store all our binary dependencies in separate repositories.

A short discussion about virtual environments

When preparing this work, we also discussed the use of virtual environments for the build process. Thereby, I especially zoomed in on the pipenv project. Pipenv would allow us to give a very simple overview of external dependencies needed for the project, fetch them on demand from PyPI, etc. However, it was decided not to build on pipenv for this:

1. It would significantly increase the build time on appveyor
2. It would make the build procedure more complex. People would have to run pip install pipenv and ppienv --python 3 -d install before they could get started.
3. Most importantly, using pipenv would introduce an additional package management workflow. While pipenv would allow us to drop some git submodules, we would still have to keep submodules for espeak, sonic, liblouis, etc. Pipenv offers no capability to deal with non-python packages. An update of dependencies would also require a user to take extra precautionary measures to make sure that their dependencies are up to date.

having said that, we encourage users to embrace the concept of virtual environments. The python documentation of venv is helpful to get to know more about this.

Description of how this pull request fixes the issue:

• Stores py2exe by @albertosottile in a repository using Add py2exe 0.9.3.1 commit 786c4d3 py2exe-bin#1
• Stores comtypes by @enthought in a repository using Populate repository with comtypes 1.1.7 comtypes-bin#1
• Updates the wxpython-bin repository for Python 3 using Update wx to Python 3 version wxPython-bin#1
• Removes pywin32 and py2exe from misc dependencies using Remove py2exe and pywin32 dependencies from miscdeps nvda-misc-deps#11

This pr also logs the version of six to the NVDA log when logging information about the current version of wx python.

Testing performed:

Tested using @josephsl's py3000 branch, cherrypicking the commit from this pr. Also made sure that py2exe imported correctly from the python console. NO attempts have yet been made to build NVDA with py2exe from this repository, see #9605

Known issues with pull request:

• This is a draft pr until all the mentioned child pull requests are merged.
• This pull request does not deal with alternatives for EpiDoc, txt2tags and the Python 2 version of brlapi for BRLTTY

Change log entry:

• Changes for developers
  • Updated the Six package to version 1.12.0.

[LeonarddeR]

Note that this expected to fail at this stage.

[LeonarddeR]

Blocked by #9639