PoE 3.21 Update to Deadeye KB CoC Fireball Nimis recommendations

- Build seems just as good.
- Nimis/Fireball/KB interactions remain intact according to Bex (https://twitter.com/GrimroPOE/status/1641592719243120640).
- Sniper's Mark unnerfed.
- May need to adapt some tree masteries given that half or more of the 3.20 masteries have been swapped out for new ones.
- Reservations will be different given that determ/grace/precision reservation masteries have been nuked (though we do receive a global RMR Mastery in exchange)
- May be able to anoint Vengeant Cascade as a budget single-direction option before Nimis; they changed all sources of Return to behave how Nimis's Return behaved on launch in 3.20. Of course, omni-directional firing from Nimis is the ultimate QoL, but Vengeant Cascade would free up a ring slot for easier building while also giving you control over where your proj are concentrated.
- For ailment avoidance, maybe stick with stormshroud, the essence helm suffix for shock avoid, and a single jewel suffix. Relics didn't go core so that is not an option. Another route is to use the new Ancestral Vision Viridian Jewel which converts suppression chance to ele ail avoid at 50% value, but that seems wasteful of a jewel slot, unless you can get all ele ail avoid instead of shock-specific avoid somewhere on gear and skip out on using Stormshroud altogether.
- Sabo might be a viable option with its new CDR node and Triggerbots node. I doubt it will feel better than Deadeye though; you lose all the proj modifiers, the incredible mark effect, and of course deadeye tailwind. Can replace Crusader CDR boots with tailwind boots but it won't make up the entire difference in QoL.
- We don't yet know the extent of power we can find on weapons, so that's something to look forward to. There are probably some amazing things for a proj-heavy build like this one!