v4.3.0

• Simpler continent shapes. Larger in general with narrower oceans inbetween.
• Low erosion (mountains, highlands) is more common, high erosion areas (swamps,windswept) have simpler shapes.
• Smaller humidity zones. Made "Extreme" humidity (dark forest, sunflower plains etc) less common, leaving more space for the rarer in-between biomes such as birch forest.
• Terrain shape tweaks - more jagged mountains, less super-steep cliffs, more hills in eroded areas.
• Made river tunnels more common and able to go under mountain peaks again.
• The ugly chunk border line artifacts are now less common.