Nimis changes for 3.21

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Simplified projectile returning. Previously some effects that caused projectiles to return specified they only did so at the end of their flight, others only from a final target, and a few from either case. Now all effects that cause projectiles to return do so in any case that they can.
Projectiles which explode or otherwise destroy themselves only when they cannot move further, such as fireball, which return will now consistently not do so until after they have returned, just like they don't do so before piercing, forking, or chaining if they have those behaviours. Previously this was inconsistent. As a general rule, if a projectile wouldn't do something when it pierces or chains from an enemy and continues on, it also won't do that when it hits an enemy and returns from them.
Projectiles from skills which force them to explode or otherwise destroy the projectile before checking for other behaviours, such as the Concoction skills, will now consistently prevent returning, just like this prevents other projectile behaviours.
Projectiles which initially fire at a specific location rather than in a direction, such as Caustic Arrow, now ignore this when returning, so they will continue past you until they hit something.