Replace 0xSplits with new ERC20 Royalty Vault

[Spablob]

This pr introduces new logic that replaces 0xSplits tooling with a new Ip Pool:

• The royalty NFT is replaced with an ERC20 royalty token to increase composability and accuracy in royalty calculations due to the higher number of decimals
• It eliminates the ancestor pool for code simplification/reduction by moving relevant logic to the Ip Pool contract
• Claiming is easier to integrate as information lives fully on-chain, whereas previously it lived partly-offchain (0xSplits)

In the Ip Pool contract:

• Ancestors can "collect" royalty tokens and any accrued royalties once/first
• Any royalty token holder can "claim" revenue tokens (USDC, USDT, etc)

[LeoHChen]

like this direction. Is ERC20Snapshot a standard token?

[jdubpark]

like this direction. Is ERC20Snapshot a standard token?

ERC20Snapshot is in OpenZeppelin's v4 codebase but was deprecated in v5.

[jdubpark]

Have we looked at Votes.sol in OZ v5, which is suppose to replace ERC20Snapshot (and focus more on voting)?

See this comment

To add more context:

• ERC20Snapshot was released before ERC20Votes, it was a first approach.
• When ERC20Votes was released it was considered the better option. In particular becauseits a more standard interface that is supported by some third party tools (such as Tally)
• Our governor is compatible with ERC20Votes (and ERC721Votes), but not with ERC20Snapshot.

Planning for 5.0, we felt that the Votes module was the go to solution, and that ERC20Snapshot was no longer relevant. We decided to deprecate it, and it is now removed for the repo. It remains available in the 4.x packages.

If you really want, you should be able to adapt ERC20Snapshot to 5.0 easily.

[Spablob]

Have we looked at Votes.sol in OZ v5, which is suppose to replace ERC20Snapshot (and focus more on voting)?

Yes, we checked. ERC20Snapshot seems more of a fit to our use case.

[LeoHChen]

make another batch of review, still need more clarification.

[LeoHChen]

Approve it for the release, a few minor clarifications are still needed, can communicate offline.