bed's enhanced vanilla

This update includes some biome effects and other ambient changes!

• Leaves are now white in snowy biomes
• Added ambient effects for snowy weather and toggles for it
• Ambient snowfall particles now display from blocks that have top snow on them
• Birch leaf color is now dependent on elevation
• Adjusted the grass and water color for snowy biomes and swamps
• Added ambient sparkling effects on packed ice blocks and a toggle to disable them
• Config options have been updated