[PATCH] Pause production when the entity is garrisoned

[leper]

When training units from a hero (Cyrus for example) and garrisoning the hero, the production keeps going and after it is finished a notice shows up that no space to spawn the trained units to has been found.

By doing so one can produce units from the hero without any chance for the enemy to damage the hero. (Ungarrisoning the hero spawns the units right next to it)

The attached patch pauses the production when the unit (hero) is garrisoned and resumes it when the unit is ungarrisoned again.

Also see this related forum topic.

[leper]

In 13414:

Pause production if the producing entity is garrisoned. Fixes #1931.

[leper]

(approved on irc)