In old map areas, structures where Mese was used, and player inventorues, the
old black-on-yellow block is present as it used to be.
In newly-generated map areas, Mese Crystals in Stone will generate instead, as
default:stone_with_mese. Old Mese is not generated at all anymore, as this
object is deprecated.
When dug, the new Mese Crystals in Stone drops a single Mese Crystal as before,
while digging the old Mese object returns exactly those objects as before.
Mese Crystals can be crafted into Mese Blocks or into Fragments as before.
Mese pickaxes are crafted from Mese Crystals and sticks.
The original default:mese, if needed, can be obtained by crafting two Mese
Crystals, which yields two of the old Mese object. Two of these can be crafted
back into two Crystals if needed.
