Convert Windows Install to PyInstaller

[danyeaw]

The current method of building Windows packages takes about 1 hour. It requires redownloading and installing all of the needed packages to a build root, compiling everything, removing unnecessary files, creating an exe, and then packaging it into an installer. It is prone to many issues, and troubleshooting it takes a very long time because the iterations are so long.

This PR attempts to fix this by using PyInstaller instead. It takes a different approach to analyze the code and look for dependencies. This is very fast, and I can package the app in to an installer in 6 minutes - with most of the time spent building the installer and portable installer files themselves.

There are issues with PyInstaller and GTK/msys2. I have been working through these, but this is the current status:

• Testing in Linux results in an error about png be an unsupported type: Hook for gi.repository.GdkPixbuf Looks for gdk-pixbuf-query-loaders on PATH pyinstaller/pyinstaller#4485
  Found workaround using env PATH="$PATH:/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0" pyinstaller -y gaphor.spec
• Create issue Windows Package Shows the Console while Running #216 to capture Windows only works with console enabled.

PR Checklist

Please check if your PR fulfills the following requirements:

• I have read, and am following the Contributer guide
• I have read and understand the Code of Conduct

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation content changes

What is the current behavior?

Very slow windows build times.

Issue Number: N/A

What is the new behavior?

Build times are a couple of orders of magnitude faster.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[amolenaar]

The code looks good. It's far less code, which is always good. Is there an installer .exe file I can try on my vanilla windows machine?

[danyeaw]

@amolenaar I have uploaded an installer for testing to a draft Release.

[amolenaar]

I finally ran the installer on my (vanilla) Windows machine.

It works :)

[danyeaw]

@amolenaar Ya, now if we can only get rid of that pesky command prompt that pops up!

[amolenaar]

Isn’t the ‘pythonw’ executable supposed to take care of that?

[danyeaw]

We need to build the app using the windowed option, which only fails when debug mode is disabled 😵