Update all female_citizen actors so that idle animations properly show carried resources.
By refactoring unitAI slightly, we can easily improve our support for running/walking/idle animations.
Other gatherer entities (and other entities with custom walking animations for certain variants) will need to be updated individually at a later point to support this feature.
Reviewed By: bb, fatherbushido (a while ago)
Differential Revision: https://code.wildfiregames.com/D311