Add job queue; e-mail sending; password reset support

app/unit/SMTPUnit.js

@@ -0,0 +1,29 @@
+const { Unit } = require('libflitter')
+const nodemailer = require('nodemailer')
+
+class SMTPUnit extends Unit {
+    static get name() { return 'smtp' }
+    static get services() {
+        return [...super.services, 'configs']
+    }
+
+    config() {
+        return this.configs.get('smtp')
+    }
+
+    transport() {
+        return this._transport
+    }
+
+    async go(app) {
+        const config = this.config()
+        this._transport = nodemailer.createTransport({
+            host: config.host,
+            port: config.port,
+            secure: config.secure,
+            auth: config.auth,
+        })
+    }
+}
+
+module.exports = exports = SMTPUnit