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

TechDudie

2021-02-09 43acec290067f9aca534647d46ba1f13cfeb377a

 technic/machines/LV/alloy_furnace.lua

@@ -4,9 +4,9 @@
minetest.register_craft({
   output = 'technic:lv_alloy_furnace',
   recipe = {
      {'default:brick',           'default:brick',          'default:brick'},
      {'default:brick',           'technic:machine_casing', 'default:brick'},
      {'default:brick',           'technic:lv_cable0',      'default:brick'},
      {'default:brick', 'default:brick',          'default:brick'},
      {'default:brick', 'technic:machine_casing', 'default:brick'},
      {'default:brick', 'technic:lv_cable',       'default:brick'},
   }
})