Wetland Whimsy

Wetland Whimsy has been backported to 1.20.1! This release is mostly identical to the 1.21 version, however there are a few notable differences - Marshes spawn differently due to this version lacking Biolith, and Arenas do not exist in this version due to the lack of trial spawners.

Note: many planned features for the future are based around features added in 1.21, such as Trial Chambers. This will as such most likely be the only 1.20.1 release, outside of potential bugfixes.