Not compatible with solidity >0.8

With the latest solidity versions using SafeMath natively, [this](https://github.com/summa-tx/memview-sol/blob/eb6f128f2717175e5b66012671278ec9fe3b233f/contracts/TypedMemView.sol#L512) line should be within an unchecked block to remain compatible when looking for 32 byte chunks