Fixing several very important issues but loosing the other important changes from the previous commit. (How I made that again?)
Reconstruct previously lost changes. (Mailny decline and increase in unit strength of attacking Romans.)

Summary of what the previous important commit should have achieved:

Tries to nullify Roman building's decay directly using trigger sc
ript
code instead of creating a separate tech (which may affect other
maps
and also requires us to add the tech to the army_camp's Productio
nQueue).

Improves state enter messages.

Generalises spawning units.

Fixes construction phase (timeout issue and conditions as well as
amassing enemy units in the fortress).
Fix missing comma. Fix wrong owner of spawned Roman units. Add further messages.
Weaken Romans. Centurio working. Druid working. Decline and reinforcements working. Finally a working version again.