* Some (sadly breaking) improvements to the API, after feedback and concerns provided by users:
- Moved calculation of the translation key to the FluidAttributes constructor, so that builders can be shared between still & flowing sub-fluids.
- Moved biome-based coloring to a dedicated FluidAttributes.Water variant, which is not used by default.
- Added logic to automatically gather fluid textures into the list of textures to bake.
- Patched BucketItem and FlowingFluidBlock to avoid eager access to the fluid objects.
- Added a ForgeFlowingFluid class, as a more user-friendly way to construct a new FlowingFluid.
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