NoteBetter Alpha 0.2.1

• Renamed material_of -> material.

• Sounds can be an object instead of a string, and can take a "volume". Format:

  {
      "name": "minecraft:note.harp",
      "volume": 3.0
  }

  (Valid for "default", "blocks[#].sound", "materials[#].sound" - basically anything that previously took a sound string)

• Major refactoring.