Power Furnace

Power furnaces can smelt items by consuming power.
 * Maximum power storage (Tier 1, Iron): 25000
 * Maximum power storage (Tier 2, Gold): 50000
 * Maximum power storage (Tier 3, Diamond): 75000
 * Burn time (ticks) (Tier 1, Iron): 200
 * Burn time (ticks) (Tier 2, Gold): 300
 * Burn time (ticks) (Tier 3, Diamond): 400
 * All power furnaces consume 30 power per "burn" and will activate the furnace for the specified amount of time in ticks.
 * Power furnaces input power through the note block.
 * A "focusing crystal" (Prismarine Crystal) must be placed in the bottom slot for the power furnace to function. Item to be smelted is placed in the top slot.
 * This is different from power chargers and power generators!
 * Place a sign on the note block of the multiblock and write  on the first line.