Bonus Blocks 2.4 (BTA 7.1)

Golden Fence
Iron Girder

Copper and Silver Recipe tweaks
2 blocks instead of 1 from 4 ingots
copper gives 3 stairs and 3 slabs now instead of 6
Fix incorrect block in an item group
turned volume down on windchimes and lowered chance of playing noise

Full Changelog: 2.3.2...2.4