Windows instructions

[Locke]

I spend some time looking into the build on Windows 10. Note that I have no experience with Python3 packaging and GTK on Windows.

Good news first: I was able to create a binary that can be started without having to install anything. On the first glance it looked complete, but I didn't test everything.

I'm writing this PR to document my results, so that someone else can continue from here on.

In my description I'm using PyInstaller with the command pyinstaller FAHControl --windowed. This has two issues:

• I could not get pyinstaller FAHControl --onefile --windowed to work, which would be easier to distribute. When I try to start the exe I get the error gi/_gi-cpython-38.dll could not be extracted!
• This is a manual invocation, I have not integrated this in setup.py as it looks a bit complicated looking at https://github.com/pyinstaller/pyinstaller/wiki/Recipe-Setuptools-Entry-Point and https://stackoverflow.com/questions/48884766/pyinstaller-on-a-setuptools-package

Before I tried PyInstaller I tried cx_Freeze, but encountered several issues in the current published versions:

• With cx_Freeze installed via pip I encountered this issue: libffi-7.dll not found with msys2/mingw64 marcelotduarte/cx_Freeze#596
• As suggested in that issue I uninstalled cx_Freeze via pip and installed the mingw variant via pacman -S mingw-w64-x86_64-python3-cx_Freeze, however that fails with error: [Errno 2] No such file or directory: 'C:/msys64/mingw64/tcl/tcl8.6'
• I tried to set TCL_LIBRARY and TK_LIBRARY paths, but then had the issue tkinter path error marcelotduarte/cx_Freeze#566 I did not try out the suggested workaround to copy the files manually, might be worth to look into
• I completely excluded tcl/tk just to see if everything else would work but then was stopped by something wrong with sqlite3...

As an alternative to MSYS2 / mingw I tried out the usual windows python installation and to install gtk via vcpkg packages as suggested in https://www.gtk.org/docs/installations/windows/#using-gtk-from-vcpkg-packages I think this also required to install "Build Tools for Visual Studio 2019".
Unfortunately I think I was too inexperienced with all of this, as I failed to tell pip install PyGObject where to find the libraries / header files.