Adding element nft

[rstevens2022]

A few changes since the last time I opened this

Have table defs for all three of these contracts (ERC115, ERC721 old, ERC721 new) with the main Element exchange being the contract address in the files (all three are identified as proxies on Polygonscan)

[TimNooren]

@rstevens2022 LGTM, but just wanted to check whether Old and New is the right terminology. If that's what is used by the project itself then I guess that's fine, otherwise maybe something like V1/V2 would be more future-proof.

[rstevens2022]

Hi Tim!

The reason I went with "old" vs "new" is because I don't see any references to versioning in the Element docs (I actually don't see a reference to 0x205 at all even though it does seem to be an old implementation) - I just wasn't sure if it was a V1 versus V2 thing or a V1.1 versus V1.2 thing and I didn't want to label incorrectly - but I can definitely just switch to V1 and V2 for sake of clarity and to leave room for the situation where a newer version is released

[TimNooren]

The reason I went with "old" vs "new" is because I don't see any references to versioning in the Element docs (I actually don't see a reference to 0x205 at all even though it does seem to be an old implementation) - I just wasn't sure if it was a V1 versus V2 thing or a V1.1 versus V1.2 thing and I didn't want to label incorrectly - but I can definitely just switch to V1 and V2 for sake of clarity and to leave room for the situation where a newer version is released

https://element.market/polygon seems to reference 2.0 quite prominently. Maybe this proxy upgrade is somehow unrelated, but otherwise V1/V2 seems like a safe choice.

[rstevens2022]

got it! updated!