All Possible Royalty Scenarios

As royalties are done on a best effort basis, there are a couple of special cases we have to handle

royaltyNumerator is set	ERC2981 is set	receiver is set in ERC2981	royaltyRecipientFallback is set	What happens to Royalties
Non-zero	Yes	Yes	N/A	Sent to ERC2981 Receiver
Non-zero	No	N/A	Yes	Sent to the royaltyRecipientFallback
Non-zero	Yes	No	Yes	Sent to the royaltyRecipientFallback
Non-zero	Yes	No	No	Sent to the pool
Non-zero	No	N/A	No	We don’t allow this configuration
Zero	N/A	N/A	N/A	No royalties