Initial OAuth implementation

[Wires77]

This is a very early implementation of PoB interacting with PoE's OAuth API. I wanted to get this out there in draft for early reviews and to organize my thoughts while I check things off the list:

Required for MVP:

• [ ] TODO statements
• [ ] Hardening/Logging
• [x] Investigate if SO_EXCLUSIVEADDRUSE is set in luasocket (part of hardening) -- Pretty sure this only applies to pre-Windows 2003 installs and people running PoB in compatibility mode for that. I did submit a PR to luasocket before realizing that, but I may not need to bake it into PoB's implementation
• [ ] Automatic token acquisition on 401 error
• [x] Add luasocket license
• [x] Open SimpleGraphic PR for luasocket artifacts
• [ ] Server start and timeout messaging/UX

Future goals:

• [ ] Secure token storage
• [ ] Refresh token usage and storage
• [ ] Investigate behavior and QoL with multiple PoB instances open (Access token currently stored in memory, focus PoB window when redirect is made, etc)