Proxy all calls

proxy.sol

contract Proxy {
    fallback() external payable {
        assembly {
            let len := calldatasize()
            calldatacopy(0, 0, len)
            let addr := mload(0x0)
            let result := delegatecall(gas(), addr, 0x20, sub(len, 0x20), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
}