TogglePower bloacks loading but not unloading

[mevitar]

While unpowered through TogglePower, buildings don't allow anything to get inside, but passengers/occupants that were already in can leave normally when the building is given the deploy command. In fact, TogglePower doesn't even lock the deploy command for the building, but it does show the "cannot enter" cursor for anything that tries to enter, and interrupts an already ongoing process of loading units.

To compare, EMPing the structure makes it unable to receive commands, but a deploy command given before being EMPed won't get interrupted and units will still be unloading once the process already started. Loading units into an EMPed structure isn't prevented either, so the behavior is consistent here.