6.6.0-BETA-fabric

This version introduces many new features including:

Config pack development changes:

Platform Minecraft Biome Config:
- Both Fabric and Bukkit's Minecraft Biome Config have been cleaned up and Bukkit now supports the full range of options
Noise addon changes:
- Both FBM and the basic ArithmeticSampler samplers now implement the DerivativeNoiseSampler API
- You can now turn off salting the noise lookup of the Cellular sampler with the new salt-lookup parameter
- New LINEAR_MAP normalizer

Paralithic changes:

Adds support for Paralithic let expressions. Let expressions enable the ability to bind names to expressions within the context of another expression, e.g.

5 + let
  a := 3.5,
  b := a^2, // Optional trailing comma
in a * b * (let d := sqrt(x) in cos(d))

As the introduction of let expressions may break config packs and the noise predicate addon (which uses the in invocation variable reserved as a keyword in let expressions), this must explicitly be enabled in pack.yml via the following:

expressions:
  options:
    enable-let-expressions: true

The noise predicate addon will use input instead of in if let expressions are enabled, which currently affects only the EXPRESSION_NORMALIZER sampler

Terra