Add user maintenance CLI (#9)

- Add CLI infrastructure
- Add user to index page query
- Strip tags from title
- Move item parsing to FeedItem

src/app-config.php

@@ -0,0 +1,17 @@
+<?php
+
+/** The current Feed Reader Central version */
+const FRC_VERSION = '1.0.0-alpha4';
+
+spl_autoload_register(function ($class) {
+    $file = implode(DIRECTORY_SEPARATOR, [__DIR__, 'lib', "$class.php"]);
+    if (file_exists($file)) {
+        require $file;
+        return true;
+    }
+    return false;
+});
+
+require 'user-config.php';
+
+Data::ensureDb();