Add ai-common plugin

Contains common functions, starting with one to set up PHPMailer
so that it uses an external SMTP server if desired.

wp-content/plugins/ai-common/functions.php

+<?php
+/**
+ * Plugin Name: A/I Common Functions
+ * Plugin URI: https://noblogs.org
+ * Description: Custom functions used by Noblogs.
+ * Author: Autistici/Inventati
+ * Author URI: https://autistici.org
+ * Version: 1.0
+ */
+ 
+// Put your code snippets below this line.
+
+/**
+ * This function will connect wp_mail to a (possibly authenticated)
+ * external SMTP server, instead of using the PHP mail() function.
+ * 
+ * Values are constants set in wp-config.php
+ */
+if (defined('SMTP_HOST')) {
+	add_action('phpmailer_init', 'send_smtp_email');
+	function send_smtp_email($phpmailer) {
+		$phpmailer->isSMTP();
+		$phpmailer->Host       = SMTP_HOST;
+		$phpmailer->SMTPAuth   = SMTP_AUTH;
+		$phpmailer->Port       = SMTP_PORT;
+		$phpmailer->Username   = SMTP_USER;
+		$phpmailer->Password   = SMTP_PASS;
+		$phpmailer->SMTPSecure = SMTP_SECURE;
+		$phpmailer->From       = SMTP_FROM;
+		$phpmailer->FromName   = SMTP_NAME;
+	}
+}
+