Add single user security mode (#3)

- Tweaks to SQL column definitions
- Implement class autoloading
- Split user config into its own file

src/start.php

@@ -1,23 +1,16 @@
 <?php
-// USER CONFIGURATION ITEMS
+spl_autoload_register(function ($class) {
+    $file = implode(DIRECTORY_SEPARATOR, [ __DIR__, 'lib', "$class.php" ]);
+    if (file_exists($file)) {
+        require $file;
+        return true;
+    }
+    return false;
+});
 
-/**
- * Which security model should the application use?
- * - 0 = single-user, no password
- * - 1 = single-user with password
- * - 2 = multi-user (all users require passwords)
- *
- * (NOTE THAT 1 AND 2 HAVE NOT YET BEEN IMPLEMENTED)
- */
-const SECURITY_MODEL = 0;
+require 'user-config.php';
 
-/** The name of the database file where users and feeds should be kept */
-const DATABASE_NAME = 'frc.db';
-
-// END USER CONFIGURATION ITEMS
-//   (editing below this line is not advised)
-
-include 'lib/Data.php';
+Data::ensureDb();
 
 /**
  * Render the page title