Projectile callins don't include weaponNum

It is not possible for games to know which weaponNum a projectile refers to on projectile callins.

Ideally all projectile callins should include the weaponNum, if not possible then at least `ProjectileCreated` should, since that would allow games to track `projectileId <-> weaponNum`

Start by tracing the projectile callin entry points, especially ProjectileCreated, and inspect how projectileId and weaponNum are currently handled. Determine whether weaponNum can be propagated to all projectile callins or at least ProjectileCreated; done when games can reliably identify the weapon associated with each projectile.

Written by the indexing model from the issue text.