v4.13.0

v4.13.0, 2023-04-25

Generalisation of games, new BurnBothEnds strategy, added CITATION.cff file,
support for py3.10, add references and various internal improvements.

• Add references
  #1399
• Add support for py3.10
  #1398
• Internal improvements
  #1412
  #1409
  #1408
  #1407
• Add the Burn Both Ends strategy
  #1410
• Add CITATION.cff file
  #1405
• Generalise games
  #1413

v4.13.0...v4.12.0