Game server: The stack size argument is now optional for CUser::FindSlotForItem() & CUser::CheckExistItem().
Game server/king system: implemented "King's item" feature. Closes #164.
Game server: despite being a very poor fit for the server, reimplemented CONCURRENT table updates as the login server still needs a user count.  Closes #174.
Game server/skill system: Fixed #176; Bezoar/Rice cake/Maximize scrolls now change your size.