0.1.5.1 Add rocks as a sifting product from gravel and nether grit

[valsnoisytoys]

CyanideX agrees it's a good idea. ;)

[valsnoisytoys]

Moved to Subsistence repro. Oops.

[CyanideX]

This was in the right spot. 😝 I know it's hard to differentiate subsistence and infernal skies issues. Basically, anything that's a config issue with subsistence is a fault on my end and, in turn, a pack issue.