Target for non-PHK projection

[SebastienGllmt]

Problem

When the NFT is projected into the game, we need to know which address owns the NFT inside the game

In the PHK case, this is obvious (same person that owns the PHK)

However, in the Owner::NFT and Owner::Receipt case, it's not obvious who owns the projected NFT in the game

Simple solution

For these cases, we will probably need to add an extra key in the datum that encodes who owns these projected NFTs

Complex solution

If we have to add a datum to encode the owner of the project NFT anyway, we may want to consider allowing ownership of the projected NFT to be more flexible. That is to say, right now they can only be owned by a Cardano L1 PKH, but maybe we should generically allow giving permission to a L2/sidechain address (ex: EVM address) or an EVM contract (to support account abstraction), etc.