For missions that allow reinforcements as soon as the first
transporter exits the map.

Originally, the script had individual time and audio arrays for missile launch/detonation.
This was unnecessary and a more sane approach can be used in its place.

Missions like Beta-end would continue until timer timeout if everything
the player owned was destroyed while having sent off at least 1 truck
during the mission. Now, fail instantly.

Just require one transporter load.