move noise stuff

Sources/Voxelotl/CMakeLists.txt

@@ -29,11 +29,13 @@ add_executable(Voxelotl MACOSX_BUNDLE
   Random/Arc4Random.swift
   Random/PCG32Random.swift
   Random/Xoroshiro128.swift
-  Random/CoherentNoise.swift
-  Random/PerlinNoiseGenerator.swift
-  Random/SimplexNoise.swift
-  Random/RandomCollectionExtensions.swift
   Random/SplitMix64.swift
+  Random/RandomCollectionExtensions.swift
+
+  # Coherent noise classes
+  Noise/CoherentNoise.swift
+  Noise/PerlinNoiseGenerator.swift
+  Noise/SimplexNoise.swift
 
   # Resource classes
   Resource/NSImageLoader.swift