Add support for draft/account-registration

A new UI to register and verify accounts is added.

components/register-form.js

@@ -0,0 +1,54 @@
+import { html, Component } from "../lib/index.js";
+
+export default class RegisterForm extends Component {
+	state = {
+		email: "",
+		password: "",
+	};
+
+	constructor(props) {
+		super(props);
+
+		this.handleChange = this.handleChange.bind(this);
+		this.handleSubmit = this.handleSubmit.bind(this);
+	}
+
+	handleChange(event) {
+		let target = event.target;
+		let value = target.type == "checkbox" ? target.checked : target.value;
+		this.setState({ [target.name]: value });
+	}
+
+	handleSubmit(event) {
+		event.preventDefault();
+
+		this.props.onSubmit(this.state.email, this.state.password);
+	}
+
+	render() {
+		return html`
+			<form onChange=${this.handleChange} onSubmit=${this.handleSubmit}>
+				<label>
+					E-mail:<br/>
+					<input
+						type="email"
+						name="email"
+						value=${this.state.email}
+						required=${this.props.emailRequired}
+						placeholder=${this.props.emailRequired ? null : "(optional)"}
+						autofocus
+					/>
+				</label>
+				<br/><br/>
+
+				<label>
+					Password:<br/>
+					<input type="password" name="password" value=${this.state.password} required/>
+				</label>
+				<br/><br/>
+
+				<button>Register</button>
+			</form>
+		`;
+	}
+}