Cleanup of nbt/meta/data

[uncovery]

We need to cleanup the usage of the following variables:

• data: This is the old "damage" value - exists in databases and function calls
• meta: this is the old enchantment data etc. This should all become NBT

We have mixed uses of RAW nbt data (as from minecraft), NBT arrays and json-conform NBT. This needs to be unified so that in the code we only use one of them.