Add trigger points to the map.

We don't have to precreate those units. Instead in the init state of the
storyline machine, we will spawn all the entities we need.

Therefore I added the trigger points: (before you continue painting,
please pull my changes )

A: inside the village (spawn points for Gauls)

B: outside the village (seldomly used spawn points for Gauls at the
gallic dock and at the great field in the west)

C: Trader spawn points. (randomly chosen too) Then driving to the Gallic
dock.

D: Druide's spawn point (from there reinforcements due to druide ties
are spawned).

E: Enemy spawn point at the eastern-most small road.

F: Enemy fortress construction location.

G: Spawn point of a potential new Roman centurio (if the old died and
Caesar randomly decided to send a new one, mostly after a failure of the
Gauls, e.g. a failure to capture or destroy the Roman fortress at point
E).

H: free

I: waypoints for enemy units that have been spawned at the fortress'
location (F).

(J: random gather points for theses troops before attack.)

K: Center of Gallic village to know when the village is almost
overwhelmed (by counting enemies vs. Gauls around the center with
approximately the radius of the village).