Simplifiy process for spawning projectiles with weapons components

[cdsupina]

The only other type of spawned entity that is not covered under the SpawnableType system is blasts. They should be implemented similarly to the other spawnable types so that they and other projectile types can be more easily added in the future.

[cdsupina]

Adding projectiles as a spawnable won't really work because the associated data doesn't really allow it to implement hash like the other spawnables. I think they need to be their own thing separate from spawnables.