Sensible Biomes

First release on Modrinth. For people who already knew the old 1.17 version, here's the major changes:

• Complete rewrite of the 1.17 version to the new format used by version 1.20 and above.
• Most old biomes and continents were scrapped in order to make this pack compatible with other worldgen packs that modify the terrain; worlds generate the same as vanilla, only the vegetation changes.
• Added river biomes.