Implement all possible SU(2) spin models

Created by: tobiaslcmueller

Possible models comprise

• SU(2)-symmetric
  • Heisenberg
• U(1)-symmetric
  • XXZ
  • DM (single-plane)
  • Gamma (single plane)
  • Full J (single plane)
• TR symmetric
  • XYZ
  • DM
  • Gamma
  • Full J