More predictable infected ghost warps

Infected can use `sm_warpto` to warp to a specific survivor based on
either their name or their relative flows.  `sm_warpto 1` will warp to
the survivor that is currently the farthest through the map.  `sm_warpto
4` will warp to the last person.  `sm_warpto ellis` will warp to ellis
(and also francis due to char id's being the same).  Names must be
lowercase.

    bind 1 "slot1; sm_warpto 1"
	bind 2 "slot2; sm_warpto 2"
	bind 3 "slot3; sm_warpto 3"
	bind 4 "slot4; sm_warpto 4"

Try these out for some predictable functions.