Provide Vision of the whole map to disconnected players

[Martin Noya]

This might reduce the performance so it would need to be tested.

I've also received words that the ghost unit is not controllable.

Would be better to just do an AddFOWViewer of the whole map and remove the vision granted to allies in team-maps. Ideally, we also need a way to give players on a team a 'second chance' or any way to help their team while they're dead