Use selection priority when picking tooltip actor.
Track per-player frozen actors.
Show tooltips for frozen actors.
Add FrozenActor target type.
Add plumbing for issuing orders against frozen actors.
Add helper for resolving orders against frozen actors.
Enable frozen order: Attack.
Enable frozen order: DeliverSupplies.
Enable frozen order: LegacyCaptureActor.
Enable frozen order: C4.
Enable frozen order: DemoAttack.