Fix world visibility checks when shroud is disabled.
Remove obsolete ITooltip.Stance.
Add Order.ExtraData field.
Add ITargetableInfo interface for querying target types.
Change WeaponInfo.EffectivenessAgainst to take ActorInfo.
Replace Target.IsActor and IsValid with Target.Type.
Merge IOrderTargeter.CanTargetActor and CanTargetLocation.
Allow world and (render-) player actors to render.
Track per-player frozen actors.
Show tooltips for frozen actors.
Allow frozen actors to be flashed.
Add FrozenActor target type.
Implement attack orders against frozen actors.