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

TechDudie

2021-02-09 43acec290067f9aca534647d46ba1f13cfeb377a

 technic/machines/register/grindings.lua

@@ -1,6 +1,5 @@
local S = technic.getter
local moretrees = minetest.get_modpath("moretrees")
local mesecons_materials = minetest.get_modpath("mesecons_materials")
local dye = minetest.get_modpath("dye")

-- sawdust, the finest wood/tree grinding