Create a proper RepairManager to match the others, rename our old
RepairManager to RepairableManager.
Fixed bug with repairing using materials with byte metadata
Move Salvage checks into our RepairManager
Combine our placedAnvil checks into one function.
Removed option to disable Salvage via the config file. This should be
handled via permissions instead.
Unlock levels go in advanced.yml, not config.yml
Move Salvage functions into Repair