How to use the @nimiq/core.Address function in @nimiq/core

getIqonURLFor(obj, png = false, size = 0) {
		let address = null;
		if (obj instanceof Nimiq.Wallet) {
			address = obj.address.toUserFriendlyAddress().split(" ").join("");
		} else if (obj instanceof Nimiq.Address) {
			address = obj.toUserFriendlyAddress().split(" ").join("");
		} else if (typeof obj == "string") {
			address = obj.split(" ").join("");
		}

		if (address == null) {
			this.theWrapper.callbacks.error("UtilHelper:getIqonURLFor", NimiqWrapper.ERROR_MESSAGES.BAD_PARAM_TYPE);
		} else {
			if (png) {
				if (size > 0) {
					return "https://icons.mopsus.com/icon/" + address + "." + size + ".png"
				} else {
					return "https://icons.mopsus.com/icon/" + address + ".png";
				}
			} else {
				return "https://icons.mopsus.com/icon/" + address + ".svg";

sendTransaction(fromWallet, options = { }, callback = (receipt) => { }) {
		let txDetails = {
			sender : fromWallet,
			recipient : Nimiq.Address.fromUserFriendlyAddress("NQ07 0000 0000 0000 0000 0000 0000 0000 0000"),
			value : 0,
			fee : 0,
			validity : this.theWrapper.blockHeight,
			extraData : null
		};

		if (options.amount) txDetails.value = options.amount;
		if (options.expiration) txDetails.validity = options.expiration;

		if (options.address) {
			if (typeof options.address == "string") {
				txDetails.recipient = Nimiq.Address.fromUserFriendlyAddress(options.address);
			} else {
				txDetails.recipient = options.address;
			}
		}

		if (options.fee) {
			if (options.fee > 0) {
				if (options.fee < 138) {
					this.theWrapper.callbacks.error("TransactionHelper:sendTransaction", NimiqWrapper.ERROR_MESSAGES.BAD_FEE);
				} else {
					txDetails.fee = options.fee;
				}
			} else {
				this.theWrapper.callbacks.error("TransactionHelper:sendTransaction", NimiqWrapper.ERROR_MESSAGES.BAD_FEE);
			}
		}

initMiner(options = { }) {
	  	this.minerOptions = {
			pool : true,
			addr : Nimiq.Address.fromUserFriendlyAddress("NQ07 0000 0000 0000 0000 0000 0000 0000 0000"),
			data : new Uint8Array(0),
			host : "us.nimpool.io",
			port : 8444
		};

		if (options.soloMine) this.minerOptions.pool = false;
		if (options.poolHost) this.minerOptions.host = options.poolHost;
		if (options.poolPort) this.minerOptions.port = options.poolPort;
		if (options.extraData) {
			if (typeof options.extraData == "string") {
				this.minerOptions.data = Nimiq.BufferUtils.fromAscii(options.extraData);
			} else if (options.extraData instanceof Uint8Array) {
				this.minerOptions.data = options.extraData;
			} else {
				this.theWrapper.callbacks.error("MinerHelper:initMiner", NimiqWrapper.ERROR_MESSAGES.BAD_DATA);
			}