Auto-py-to-exe

- Allow PyInstaller dev branches to be used

- Fix 58: Do not supply keyword arguments to os.startfile.

- When the server stops, close the UI
- Fix 56: Stop Python process freezing when displaying tkinter dialogs
- Don't pass filetypes to tkinter's askopenfilename on MacOS

- Allow importing and exporting od argument configurations as json files
- Other improvements to behind-the-scenes state

Earlier

- No changelog notes for earlier versions.