Community Fluid API

• First pass at actually respecting those custom underfluid overlays you've been registering
• Any fluid as hot as lava now smokes in rain, rather than splashing
• Added hooks for custom splash & wake (fishing) particles.
• Provided tinted versions of vanilla splash & wake (fishing) particles
• FluidTypes now default to using the tinted versions, with your fluid tint when that tint is present (and otherwise using the biome-specific color for water). Since fluid tints are now per fluid (rather than type), this system may not work properly if you use one fluid type/tag for multiple differently tinted fluids
• Did a bit more work behind the scenes that should improve entity pose selection, friction calcs, pathing, etc.
• Fixed a bug that allowed fall impulse to accumulate on mobs while bobbing on fluid surfaces (killing them when they exited)

Also fixed some other bugs, but I'm not sure which (if any) already existed in 0.3.0.