Dev news: Realaccurate cobblestone WIP (Patreon)

I tried remaining as close to vanilla as possible with the cobblestones without sacrifing too much on the realism. This block is still WIP but here's roughly where I'd like to be headed.

first 3: use Spectrum 2020-05
next 2: BSL v7.1.05 dev
next 2: Continuum 2.1 alpha build 8
next 3: Kappa 2.2 public
next 2: SEUS renewed E2
next: LUMA
last 3: Molly