#60 Create package executable for windows

• Followed most of the same logic as was under sparks.
• Added option to manually trigger artifact build on any branch
• Used virtualenv also inside the build job so it wouldn't differ from the local setup that much
• Used a little hack to gather up all the hidden dependencies of zeroc ice - hidden.extend([Path(x).stem for x in glob.glob(glob.escape(packages_path) + "\\omero_*.py")]) since it dumped them individually in global packages module without creating modules
• Generated exe works on my machine but would like a second opinion before merging
• Removed the empty "test" stage since there are no tests at this point