* Add Base64 library to utils
* Fix typo on Base64 padding
* Added documentation for Base64 and references from ERC1155 and ERC721
* Updated Changelog
* Fix typo in utilities doc
* use mstore8 to improve memory accesses
* use shorter strings with encodePacked
* do not use using-for syntax, for clarity
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
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