TOTP Support

[andrewiankidd]

Changes

• merge changes from @homuler fork https://github.com/homuler/unity-license-activate
  • navigation improvements
  • TOTP support
  • tests
• Readability changes
• Minor logging changes

Checklist

• [x] Read the contribution guide and accept the code of conduct
• [x] Readme and docs (updated or not needed)
• [x] Tests (added, updated or not needed)