rework: rename sdbapi to api, redo data structure

fix(sdbapi): fix ctrl c & v mistake

feat(sdbapi): GameData and Action tables

feat!(sdbapi): restructure, expand user details

fix(sdbapi): name fields correctly in JSON

feat(sdbapi): add GAMESTATE_CANCELLED

WIP(sdbapi): game creation API

feat(sdbapi): replace gorm.Model with own fields

feat(sdbapi): init game management apis