NEP-454 Multi Token Standard Royalties and Payouts

[uncle-T0ny]

Those familiar with the NEP-199 payout interface for non-fungible tokens may expect a similar interface for multi token contracts.

[ori-near]

Thank you @uncle-T0ny for submitting this NEP.

As a moderator, I reviewed this NEP and it meets the proposed template guidelines. I am moving this NEP to the REVIEW stage and would like to ask the @near/wg-contract-standards working group members to assign 2 Technical Reviewers to complete a technical review (see expectations). If you want to assign yourself, please mention that you are acting as the Technical Reviewers.

Please find some guidelines below for completing the technical review.

Technical Review Guidelines

• First, review the proposal within one week. If you have any suggestions that could be fixed, leave them as comments to the author. It may take a couple of iterations to resolve any open comments.
• Second, once all the suggestions are addressed, produce:
  • A recommendation for the working group if the NEP is ready for voting (it could be approving or rejecting recommendation)
  • A summary of benefits
  • A summary of concerns and blockers that were identified on the way and their status (some will be resolved, others dismissed, etc)
    Here is a nice example and a template for your convenience:

## Example
### Recommendation
Add recommendation
### Benefits
* Benefit
* Benefit
### Concerns
| # | Concern | Resolution | Status |
| - | - | - | - |   
| 1 | Concern | Resolution | Status |
| 2 | Concern | Resolution | Status |

Please tag the @near/nep-moderators once you are done, so we can move this NEP to the voting stage. Thanks again.

[frol]

As a Contract Standards WG member, I believe we should do two things before moving forward with reviewing this NEP:

1. evaluate the necessity of the MT standard as a whole (I raised this question in the Contract Standards Community Group)
2. evaluate the state of the other parts of the standard before we dive into Royalties and Payouts (we had an offline discussion with @uncle-T0ny today, and he might be able to prepare a summary of the gaps of the current MT standard and potentially post it on Gigs Board)

[ori-near]

As the moderator, I assume this PR is no longer active given that there was no activity for over two months. Therefore, I am closing it. If anyone is interested in reopening this PR, please submit a new one.

[alexastrum]

We're currently in the process of getting mt approved.
Royalties and Payouts should probably be part of that standard, rather than a separate NEP.