Return the object representing the player that caused the calling func‐
tion to be called. Note that this_player() may return a different
value than this_object() even when called from within a player object.
If this_player is called as this_player(1) then the returned value will
be the interactive that caused the calling function to be called.
this_player(1) may return a different value than this_player() in cer‐
tain cases (such as when command() is used by an admin to force a
player to perform some command).