varaverk: add media, confform, script API/include files (from previous session)

media.php: Emby/Jellyfin/Plex session poller for Streams card
confform.php: conf file form helpers for Config tab
script.php: per-script run/log API endpoint for Scheduler tab

Plugin/usr/local/emhttp/plugins/varaverk/api/media.php

@@ -0,0 +1,5 @@
+<?php
+header('Content-Type: application/json');
+require_once dirname(__DIR__) . '/include/media.php';
+
+echo json_encode(vv_media_sessions());