Add handling for corpse death location

Tracking corpse locations

If a server restarts or goes down and comes back up corpses should remain dead in there corpse state at the location they were killed at. Currently a corpse will appear at the normal spawn-in location when the NPC is alive.

We need to add the required info to the database to track the location of an NPCs when they are killed

When an NPC respawns normally via timer the information can be removed.

Currently the database tracks "deathState" (creature table) to let the core know if the NPC is dead or not.

I am proposing we add "deathPosition_x" deathposition_y" "deathposition_z" - these would be empty if "DeathState" is 0.