Hopo Better Mineshaft

--- 1.21.4 drop! --- ♦ Added a little creepy sound when you enter to one of my mineshafts for the first time ever, i like add small details like this, the sound is not that creepy tho! :) ♦ Added the Pale Mineshaft, as always they are almost the same as the other ones, however this structure it's another alternative to get Creaking Hearts ♦ 1.21.4 compat