Add "dummies" to showcase damage dealt

[VanillaCold]

• Add dummy object, make them easy to spawn in
• Add projectiles for player vehicle
• Find out damage is calculated and use said calculations to calculate the damage dealt to a dummy.
• Add an indicator howing how much damage was dealt
• Add SPUI buttons for spawning in dummies

Dummies would only be present in non-spaceship/colony/economic vehicle test drive, with SPUI buttons to spawn one in. They'd have a decent chunk of health and would show off how much damage your vehicle can deal.