Task for code cleanup:
- Remove SocialUser prefix from classes, config files, etc.
- Remove OIDC from appropriate class names.
- Remove social or su from log statements - could improve log statements in general
- Change Id to ID where appropriate
- Add/replace with our code header
- Add MIT license to copyright set in distribution if needed
- Fix most checkstyle nits
- Add nullability annotations as convenient/obvious
- Review/correct javadocs