Community Fluid API

Huge list of improvements. Check the commit log for details. Most user-visible changes:

• Nautilus now path correctly in modded fluids (no more awkward floating around)
• (Riptide) Tridents work
• Drowned are now smart enough to take cover in modded fluids
• Underwater sounds, splashing on entering/exiting, etc. now apply correctly
• Splash bubbles have the correct duration
• Wolves can now be wetted
• Dolphins are probably less likely to commit suicide
• First pass at supporting a bunch of additional animals, and their spawns
• First pass at thrown projectile slowdown
• Item movement logic is now implemented
• Several more methods have been patched into FluidType
• Fluids can now stop mobs from catching fire (from sunlight) in the first place
• fishing methods now have extra context, to simplify loot tables
• FluidType light levels are now respected (unless blocklight is higher; still need to set LiquidBlock's hasDynamicLightEmission to true if you plan on dynamic light levels)
• First pass at supporting vehicle slowdown/ quieting

Will probably add a method to change out the splash particle later, in case your fluid isn't blue.