Wrapper proxy non wrbtc pairs

[cwsnt]

Refactor rbtcWrapperProxy to support non-wrbtc for providing liquidity

[tjcloa]

CD6 - Don't use assert, tx.origin, address.transfer(), address.send()
https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/

import "../openzeppelin/SafeERC20.sol"; // copy from the protocol or from OZ - install proper version

using SafeERC20 for IERC20; // in the contract

address to; - to allow transfer to a contract address too (e.g. multisig)

Suggested change

	function withdraw(address token, address payable to, uint256 amount) external ownerOnly {
	require(amount > 0, "non-zero withdraw amount expected");
	require(to != address(0), "receiver address invalid");
	if (token == address(0)) {
	require(amount <= address(this).balance, "withdraw amount cannot exceed balance");
	to.transfer(amount);
	} else {
	require(IERC20Token(token).transfer(to, amount), "Failed to transfer the token");
	}
	function withdraw(
	address token,
	address to,
	uint256 amount
	) external ownerOnly {
	require(amount > 0, "non-zero withdraw amount expected");
	require(to != address(0), "receiver address invalid");
	if (token == address(0)) {
	(bool success, ) = to.call.value(amount)("");
	require(success, "transfer failed");
	} else {
	IERC20(token).safeTransfer(token, to, amount);
	}
	}

[tjcloa]

lgtm
pls resolve all conversations (comments)

[Alitasovryn]

Tested and reviewed the testRBTCWrapperProxy.js file.