Changes

Implement tinted and soul glass for smelteries and foundries

Tinted Seared Glass and Tinted Scorched Glass work like Tinted Glass, but in smeltery/foundry walls
Soul Glass now can be walked through by entities, allowing you to make doors in a smeltery that can be passed but hold back fluids

Make powdered snow a fluid

Right now is just used for a spilling effect, not sure if I will do anything more with it in the future, but it felt wrong to not have it

Make spitting apply knockback and allow punch to work on it

Spitting projectiles now apply a bit of knockback, which can be boosted with punch, same rates as arrows
Punch now works on any ranged weapon, though it won't do anything for slings, probably too much to make punch add to power there
While changing knockback stuff, merged the two recipes for knocback between chestplates and melee, holdover from when those were distinct modiiers

Disallow applying tilling to kamas, as it starts with tilling

Salvage still lets you remove it so you can reclaim the slot upon updating your world