feat: added adr for burning or tterc721 token

[justussoh]

This PR adds decision records of burning TradeTrustErc721 token to 0xdead instead if 0x0.

[rjchow]

Suggested change

	However, TradeTrust is still required to render and track burnt token. Since unminted tokens and destoryed token have the same owner address in the Erc721 Token Registry, we needed to find a way to differentiate a unminted and burnt token. This means that TradeTrust would have to modify the ERC721 implementation or modify its verifier method.
	In the TradeTrust application, tokens are still required to be traceable and viewable after destruction. Since unminted tokens and burnt token appear to have the same owner address (.ownerOf() throws error 'cannot query non-existent token') in the ERC721 Token Registry, it is necessary to find a way to differentiate an unminted and burnt token.
	There exists two broad approaches to resolve this:
	1. The ERC721 implementation is modified to support the additional state of 'destroyed'
	1. The verification method in OpenAttestation or TradeTrust is modified to detect the history of the token, if any exists

[rjchow]

Suggested change

	#### using 0xknown as burn address (like [0x000000000000000000000000000000000000dead](https://etherscan.io/address/0x000000000000000000000000000000000000dead))
	#### using a known address as a burn address (e.g [0x000000000000000000000000000000000000dead](https://etherscan.io/address/0x000000000000000000000000000000000000dead))

[rjchow]

Suggested change

	This method instead would see that the token would be burn to `0xdead` address, a known burn address which no one has the keys for. Subsequently, in order to track the token, we will need to check the `ownerOf` token from the token registry.
	This method instead would see that the token would be burn to `0xdead` address, a known burn address that there is an extremely infinitesimal chance anyone has the keys to. Subsequently, in order to track the token, we will need to check the `ownerOf` token from the token registry.