Windows exe launcher

[vkbo]

Summary:

This is a simple novelWriter.exe launcher that runs the embedded pythonw.exe with novelWriter.pyw and then exits. It also passes on the first command line argument, so it can accept a file path to load.

All of this works on my Windows 10 VM, but is highly experimental until properly tested.

Related Issue(s):

Reviewer's Checklist:

• The header of all files contain a reference to the repository license
• The overall test coverage is increased or remains the same as before
• All tests are passing
• All flake8 checks are passing and the style guide is followed
• Documentation (as docstrings) is complete and understandable
• Only files that have been actively changed are committed