Added Blocks

• copper bars variants
  • copper bars
  • exposed copper bars
  • weathered copper bars
  • oxidized copper bars
  • waxed copper bars
  • waxed exposed copper bars
  • waxed weathered copper bars
  • waxed oxidized copper bars

Changes

• Changed name from "simple-3d-iron-bars" to "simple-3d-bars".
• Changed description from "3D Iron Bars" to "3D Bars".
• Updated pack.mcmeta to support the new changes:
  • Removed fields pack_format/supported_formats
  • Added fields min_format, max_format