Runs the autoselect message in the weapon cogs and returns the bin number of the cog
that returned the highest number. Syntax:
weap_bin=AutoSelectWeapon(player, select_mode);
select_mode: If the select_mode is valid, it becomes the senderref of the autoselect message.
The weapon cogs use the variable to find out what type of cog is looking for a selectable weapon.