rename the hotbar select request pacet, and functions on both ends
add some safety checks in server, for if !player on receive info events

they can in theory never happen, but if they do...it means there's a bug
in the server somewhere. clients cannot use this maliciously though.
either their connection is not valid/accepted, or it is and there is a
player object for him on the server, and so any send events are completely
valid.