remove "user_name" column from the "games" table
- split "game_players" table into "go_players" and "rengo_players" tables
- remove "ranks" and "game_types" tables
- rename games.user_cd to games.user_name
- rename games.user_rank_cd to games.user_rank
- remove "white_name", "white_rank", "black_name" and "black_rank"
  columns from "games" table
- games.game_type_cd can be one of "go" or "rengo"
fix Indexer
fix GameRecords