v0.2.1-preview

New features

• Added Unicode plaintext piecepack diagram generating function cat_piece.
  Thanks James Vipond for some Unicode character suggestions.
• Added prototype "Portable Piecepack Notation utilities" read_ppn, animate_game,
  plot_move, and cat_move (#11).
• Starting board generators for specific games:
  • df_cell_management
  • df_everest
  • df_fujisan (#24)
  • df_twelve_mens_morris
• Fuji-san solver solve_fujisan (#22).

Breaking changes

• df_ultima_chess renamed df_ultima, df_baroque_chess added as an alias