[NYI] Waypoint paths from SAI

[Sarjuuk]

world.waypoints.entry may be arbitrary and assigned to any creature via SAI during runtime.

This implies:

• a creature should be able to display multiple, possibly disconnected, paths.
• a path cannot be stored hard linked to a creature guid like it currently is.

[Sarjuuk]

waypoint_data after waypoints has been dropped by TDB