#3 monsters move around map

[rock808]

Create a way for monsters to move around the map.
Perhaps some may move randomly, perhaps others
will follow a set path/course.

Putting monsters on a set course could lead to interesting
player quests, such as: There is an ancient red dragon
leading a few other dragons towards Gornath to kill as many
low level humanoids (players) as possible, and then take
all the treasure back to their lair. Highlayers may
wish to team
up (or get hired) to go fight against the dragons
before they
reach Gornath. -- just one example of many.

[rock808]

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NPCs (monsters, shop owners, etc) are now being inserted in
to the
database, and so have a location which can move around.
Currently
there is only support for random walking.

We need to add some mechanism for specific NPCs to follow a
path.

Perhaps a DB table "phaos_travel" which contains the NPC id,
and a list
of map locations they walk along (like patrolling a set
path), and then
also a field for direction (forward or reverse through the
list).

If anyone has other ideas please post them!