[suggestion] Allow a projectile to be a particle

[Jetpack-Cat]

1.16.5 Gun mod suggestion: Allow the use of a particle instead of a model or item as a projectile. Items and models take on shadows, whereas particles remain at full brightness. The aesthetics of slow moving energy projectiles are ruined by shadows when they should be at full brightness. (Using emissive textures when using shaders can fix this, but most people won’t use optifine). unze2unze4#6667 on the gun mod discord channel made the projectile invisible and spawned a particle every tick to create the effect. I have no clue if that’s the most efficient way to do it, that’s just what he did.