Make slimes absorb other slimes.

[K0-RR]

https://www.curseforge.com/minecraft/mc-mods/fires-survival-tweaks?comment=49

Currently, slimes can absorb Slime Blocks to grow, they should be able to absorb other slimes too.

[The-Fireplace]

This might take some consideration to figure out a good way to do it, considering that slimes split into other slimes when killed and we don't want them to immediately merge again