Add Rubber Goo as replacement for the grinder (#578)

TechDudie

2021-02-09 43acec290067f9aca534647d46ba1f13cfeb377a

 technic/machines/MV/hydro_turbine.lua

@@ -30,8 +30,8 @@
local run = function(pos, node)
   local meta             = minetest.get_meta(pos)
   local water_flow       = 0
   local production_level = 0
   local eu_supply        = 0
   local production_level
   local eu_supply
   local max_output       = 40 * 45 -- Generates 1800EU/s

   local positions = {