Hydrological (Overworld Terrain & Biomes)

- Added Windswept Savanna biome. 
- Added Lukewarm Ocean biome. 
- Added Deep Lukewarm Ocean biome. 
- Improved oak leaves colors. 
- Made dark oak trees taller. 
- Pruned the lower branches on oak trees. 
- Increased number of branches on oak trees. 
- Prevented leaf piles from replacing ice. 
- Fixed willow trees being unable to generate in forests. 
- Fixed dark willow trees being unable to generate in dark forests. 
- Fixed a crash related to water freezing. 
- Fixed mycelium generating underwater.
- Prevented rivers from generating in hot areas.
- Removed persistence on all leaves. 
- Doubled leaf decay distance requirement. 
- Added wood wall blocks to the logs tag, making them now used in leaf decay calculations.
- Added diagonal leaf decay. 
- Decreased max height of oak trees.
- Fixed ores not generating in the Deep Dark biome.