Modernized javascript & added packaging script

This PR addresses a few different things:

• Made renderer.js to run independent of node.js (disabling nodeIntegration) by placing the instance of zerorpc.Client as global window.zerorpcClient variable during preloading period)
• Updated all the dependencies to the current versions
• Added packaging Windows batch file per https://medium.com/@abulka/electron-python-4e8c807bfa5e