Super force build should flush fuel and inputs from furnaces

[Morgan3rd]

Getting some stone or steel stuck in your furnaces is painful enough to flush out of the factory without having to deconstruct or open each furnace on its own to fix the jam. Additionally, manually refueling furnaces when going from wood to coal, or Jellynut to rocket fuel could be a much smoother process if you're able to replace the fuels with super force build.