Rewrote map_foreachpc() so that its callback function signature now uses a more natural 'sd' instead of a DBKey/void* pair.
Rewrote atcommand_users() to use a single function, instead of depending on two helper functions and global objects.
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@12683 54d463be-8e91-2dee-dedb-b68131a5f0ec