Saturated

Cave Ruins

-cave ruins are a new tiny structure that generates at the bottom of the dimension.

-they have a guaranteed explorer map that leads to a different structure. the map usually leads to villantis, Skeletown, or the Sewer, but can rarely lead to others

-the Sewer loot can now include an explorer map, and has a much better chance of leading to said other structures

General changes

-amethyst paths in the empty caves are now much larger/more common

-finally adds grass to cave biomes that makes sense to include grass

-cave features (trees pillars, etc) should no longer generate underwater in aquafers

Note: this update is also called pre-release 1, because i'm pretty sure that after this update i'll stop marking saturated as "Beta"