add event to detect and prevent the placement of robots
fix style
Set toolClass of ItemWrench to "wrench"

Allows other mods to use the BuildCraft wrench (for things other then rotation) without needing to know the itemstack or implementing the API.
Merge pull request #2026 from ShetiPhian/patch-1

Set toolClass of ItemWrench to "wrench"
Merge pull request #2024 from AEnterprise/6.1.x

add event to detect and prevent the placement of robots
fix merge conflict