Shulker's Structures

-Made a very simple way for me to add basic structures with a few basic config options. This should drastically speed up the rate at which I can add small structures.

-Added red sandstone wells to desert biomes

-Added Alice in Wonderland inspired mushrooms to dark forest and mushroom biomes

-Added ruined nether portals 'leaking' nether blocks to most biomes

-Added small abandoned houses to the end

-Added a coarse dirt hut with cobwebs and TNT to common starting biomes

All new structures have config options to adjust rarity. Old structures have working config options to disable them, except for swamp huts which are set up as a feature and currently have no config options