Fix 221

[Xemdo]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Problem/Feature

Addresses #221

Description of Changes:

• Changed ListenAndServe to listen first and surface any binding issues before serving the HTTP server
• Added --ip and --port flags to 'twitch token'
• Added --ip flag to EventSub WebSocket server under 'twitch event websocket start'

Checklist

• My code follows the Contribution Guide
• I have self-reviewed the changes being requested
• I have made comments on pieces of code that may be difficult to understand for other editors
• I have updated the documentation (if applicable)