Unified constants & Logger

What's Changed

• Global constants by @axleantilles in #4
• add MAB constants as of MAB v2.5.1 by @axleantilles in #9
• add logger from Steve as written by Consh by @axleantilles in #7
• fix loguru dependency by @axleantilles in #10

New Contributors

• @axleantilles made their first contribution in #4

Full Changelog: 0.1.0...0.2.0