removed ice IX gun

reroll renamed -> research

spore damage increased 25%

ice IX has it's damage buffed by 50%, and freeze effect lasts 2s (up from 1s)
ice IX is no longer a gun
  but you can still get it for nano-scale field (and it's pretty strong)
tech: heavy water was removed

tech: correlated damage - duplication chance also gives % damage
(also added some minor nerfs to other duplication tech for balance)

js/mob.js

@@ -1058,7 +1058,7 @@ const mobs = {
                     if (Math.random() < 0.4) {
                         type = "heal"
                     } else if (Math.random() < 0.3 && !tech.isSuperDeterminism) {
-                        type = "reroll"
+                        type = "research"
                     }
                     for (let i = 0, len = Math.ceil(2 * Math.random()); i < len; i++) {
                         powerUps.spawn(this.position.x, this.position.y, type);