Shiver me timbers!!

In preparation for Scorchful, this update overhauls the back end temperature calculation system and introduces some new quality of life mechanics. This should make general survival in Frostiful easier, but this has been balanced out by making the Frostologer more difficult.

Changelog:

• Added Shivering. When the player is more than 50% cold, they begin shivering, which provides a small amount of warmth at the cost of hunger.
• Most snowy biomes now have an ambient temperature of -1 during the day.
• Biomes with the tag frostiful:freezing_biomes now have an ambient temperature of -3 during the day.
• Fixed an issue where some data fields on living entities could randomly desynchronize
• Fixed compatibility with Colourful Hearts
• Added regeneration to the Frostologer at 100% cold
• Fixed the minimum temperature for Frostologers, Chillagers, and Biters