A few additional commands, with an edit to *getinventorylist;

Add a few commands along with their use syntax to script_commands.txt
*getcartinventorylist;
*checkbound;
*instance_check_guild;

As well, as an edit to *getinventorylist; to push the equip slot the item is equipped to instead of 1 or 0. It will push the number corresponding to those listed in const.txt
What about the `account ID` parameter? Is it needed? (i.e. how about attachrid? or it is to be considered a frequent use case that it deserves special treatment? If we decide it is, it should be documented, I don't think I see a mention of it here in the documentation)