KenaDra

I found out this code still works with Extreme Reactors in DW20 pack for 1.12.2. But I was interested in just letting the control rods scale themselves to the current use of the reactor energy level, and tweaked it a bit. All credit to 2016mfransen, but if anyone is interested here are a couple extra lines of code: https://pastebin.com/ZqHVCeYy