Dusk Autumns Worldgen Datapack

Added 7 Biomes replacing assorted vanilla biomes:

• Snowy Stony Shore replaces stony shores in snowy regions
• Snowy Old Growth Spruce Taiga replaces taigas in snowy regions
• Snowy Old Growth Pine Taiga replaces taigas in snowy regions (seriously why are they there?)
• Frozen Mangrove Swamp in snowy regions
• Warm Rivers when a river cuts through a mesa or desert region
• Cold Forest replace forests when they are close to a snowy region
• Cold Plains replace plains when they are close to a snowy region