Mac USBKey should be more configureable

[malyon]

Right now, the usb vendor key, model key, vendor id, and product id are all hardcoded into main.swift causing a need to rebuild and package everytime a change should happen.
Adding a config file with these parameters along with some additional parameters including:

1. Key expiry time
2. boolean to say if the keys should stay on for a certain amount of time even if the usb key is pulled from the machine
3. Whether or not to look the screen when the usbkey is removed

Would all be beneficial to the tool.