More Density Functions

• Fixes:
  • Output of moredfs:single_channel_image_tessellation was a i8 instead of a u8
  • This basically doesn't matter unless you plan on using this for image-terrain generation (so, only me and Bad Apple!! World Preset)

See the changelog here

• Changes:
  • Added moredfs:cache function
• Fixes:
  • Vanilla noises and caches not working with moredfs functions
  • (0, 0) weird correlation on value_noise
  • (0, 0) correlation with extra_octaves noises