Added 2 new biomes to Tileset
Rewrote WorldManager to use bools for tiles and strings for chunks instead of having a biome string per tile. Required a lot of refactoring.
Remade the island layout using the new format
Update WorldUnlocker and WorldSave to properly set the starting biomes from island layout
Reworked Tile/Entity spawn chances to be more robust, updated all existing tiles/entities.
Don't let the player place earth on existing earth
Update SpriteTools
Rename all grass tiles for uniformity. Give each their own unique item instead of a single green grass
Update SpawnChances for existing mobs