First cut of item-with-feed and list impl

- Add strict types to all files
- Convert many queries to document commands

src/public/user/log-on.php

@@ -1,4 +1,12 @@
-<?php
+<?php declare(strict_types=1);
+
+/**
+ * User Log On Page
+ *
+ * Accepts the user's e-mail address (multi-user) and password (multi-user or single-user-with-password) and attempts
+ * to log them on to Feed Reader Central
+ */
+
 include '../../start.php';
 
 use FeedReaderCentral\Key;