Changes for normal players

• Fixed crash on startup on dedicated servers.
• Revamped rivers, they are now bigger, rarer, and more eroded.
  • Rivers do not always spawn in the same places they used to, so expect them to get cut off at the border between old chunks and new chunks.
• Villages are now more common and more likely to have their spawn conditions met.
• Pseudo-erosion on islands looks much better now.
  • Noise for islands is also different, so expect large discontinuities on the border between old chunks and new chunks.
• Snow generating over a cave looks better now.
• Fixed molten rocks not breaking faster with pickaxes.

Changes for data pack makers

• Added new way to ensure that two noise-typed column values use the same seed.
• Added analytical derivatives of voronoi.soft_distance_squared and voronoi.soft_distance.
• Script template inputs can now have default values.