149 permit repair pylon to use multiple fuels and be selective about thresholds

[jpw1991]

Compiled version here

• [ ] Confirm custom fuel types working
  • Delete config file
  • Locate Fuels in config
  • Try adding/removing types (perhaps something unusual like an iron sword?)
  • Ensure it gets consumed when repairing things
• [ ] Confirm threshold working for wood
  • Locate RepairWoodWhen and modify
  • Wooden structures aren't repaired until below the threshold
• [ ] Confirm threshold working for other
  • Locate RepairOtherWhen and modify
  • Other structures eg. stone aren't repaired until below the threshold