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ppgames is superseded in favor of the newer ppcli, ppdf, ppgamer, ppn, and pprules spinoff packages: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

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