Battle: coloured lines under unit icon

[Psitticine]

Morale loss isn't figured on a per-unit basis. Instead, each unit has either broken or it hasn't. When enough units in a squad have broken, the squads routs.

It would be interesting to have a measure of how close a unit's squad is to retreat, but it has been stated that the morale code is a bit messy, so I doubt there will be any extensions added on to it any time soon.