add recipes to grind all sand types into stone dust

OgelGames

2021-01-25 f61bb82bd1c3bc9843bf2d05211a8ccd4e2c8388

add recipes to grind all sand types into stone dust

idea from https://github.com/minetest-mods/technic/issues/573

 technic/machines/register/grinder_recipes.lua

@@ -23,6 +23,8 @@
    {"technic:sulfur_lump",        "technic:sulfur_dust 2"},
    {"default:stone",              "technic:stone_dust"},
    {"default:sand",               "technic:stone_dust"},
    {"default:desert_sand",        "technic:stone_dust"},
    {"default:silver_sand",        "technic:stone_dust"},

    -- Other
    {"default:cobble",           "default:gravel"},