Implement Neural Fiber, Neural Mesh, and the Grand Caster Robes

[Robotgiggle]

• Neural Fiber
  • Obtained by using a modified flay process on a villager and then killing it
  • Used to make Neural Mesh, the Grand Caster Robes, and the cosmetic Neural Staff
  • It's crystallized nerves :)
• Neural Mesh
  • Multipart block (like glow lichen, can fit one one each face in a single blockspace)
  • Speeds up budding amethyst blocks it's attached to
  • Each mesh provides +500% growth speed (additive)
  • Does not affect anything other than budding amethyst
• Grand Caster Robes
  • Armor set that provides various hex-related buffs
  • Defense is midway between iron and diamond
  • Provides scrying lens effect, 10% media discount, +4 ambit radius, and +2 sentinel ambit radius
  • While wearing the full set, you can pan the hex grid
  • Each armor piece has 3 variants that can be cycled with Caster's Glamour
• Hex grid panning
  • While enabled, you can use right-click (editable in client config) to drag the grid around
  • Moving away from the center applies blur and purple tint to the world visible behind the grid
  • Moving too far starts to apply the Dissociation effect, which reduces physical stats (speed, damage, mining speed)
  • Keeping the grid open as Dissociation stacks up will slowly drain oxygen, as the player zones out and forgets to breathe
  • If you ignore the debuffs and keep moving further from the center, you will eventually hit a hard limit
  • Pan offset is retained when closing and reopening the grid, but reset when erasing the grid
• Neural Staff
  • Cosmetic endgame staff like the Quenched and Mindsplice variants
  • Made using a Neural Mesh as the central ingredient

A variety of showcase images can be found here: https://imgur.com/a/CTlyNSB

[Robotgiggle]

Closing in favor of stacked PRs #1293, #1294, #1296, #1297