ppgames: Piecepack game diagrams and rules

ppgames is an R package with functions that help generate piecepack game graphics, rulesets, and books as well as functions to parse Portable Piecepack Notation (PPN) files and a Fuji-san solver. This package uses the piecepackr package.

ppgames is superseded in favor of the newer ppcli, ppdf, ppgamer, ppn, and pprules spinoff packages:

• These can all be installed with piecepackr::install_ppverse()
• See <https://piecepackr.r-universe.dev/builds> for more info on the various "ppverse" packages
• Use ppcli::cat_piece() for cat_piece()
• Use similar functions from ppdf for the various df_*() game setup functions
• Use ppgamer::solve_fujisan() for solve_fujisan()
• Use ppn for various *_game(), *_ppn(), and *_move() PPN parsing and game visualization functions
• Use pprules for various save_*() piecepack ruleset generators