[MOD] Defcon 6 Payload Race beta

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GAMEPLAY
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- Each team has a nuke truck that spawns at the starting stations at both ends of the map after 90 seconds.
- The goal is to push your nuke truck along the designated course to the enemy base.
- When your nuke truck reaches the enemy base all enemies are instantly defeated.

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TECHNICAL NOTES AND FUNCTIONALITY
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- The nuke trucks have a small vision range. Friendly ground units nearby will cause it to drive along the track.
- The nuke trucks will heal friendly ground units within its vision range.
- There is a 15 second idle counter when a truck stops being pushed. After 15 seconds the nuke truck will begin driving back to the nearest checkpoint.
- The 2 checkpoints provide your team additional rewards (Checkpoint 1: Each team player receives tech buildings. Checkpoint 2: Each team player has their 2nd supply dock stocked).
- Stealthed units cannot push the nuke truck.