Chisel compat

[WaitingIdly]

what this PR adds:

• add sound bracket handler
• fix typo in extendedcraft.groovy example file (was called extremecrafting)
• add chisel compat for creating or removing groups and adding or removing items from groups
• add error handling for oredict groups (cannot remove items from the chisel variation, have to remove the items from the oredict)
• an examples file for the above

[Testure]

You turned my scroll bar yellow with NPE warnings. Other than that, looks good.