Dont allow to place not-fuel items in the fuel field in the furnace and dont allow to place any item in the dst field

how did this line get there?

also, license follows the default one since thats how the textures for
minetest_game usually work.

Fixed default_grass_side.png

object found *among* the stone.

That is, mese should behave such that you get something potentially useful out
of the aggregate block you just broke, rather than just collecting the whole
block when mined.

Mese crystals in stone give a single Mese Crystal when mines. Craft three of
those + 2 sticks for Mese Pickaxe, or 9 for a Mese block. Craft one Mese
Crystal by itself to get 9 Mese Crystal fragments, which all mods should use
when a full Mese Crystal is too much.

This includes new textures for the above objects, tweaks to the sounds used for
them, and naming tweaks for the textures used for default mese in stone, so
that old texture packs don't use the "wrong" image.

This represents my best effort to match C55's suggestions.