Security fix: unauthorized access (#10091)

* Security fix: unauthorized access
Affects nginx users:
Moved php files outside of public html directory (Apache was protected by .htaccess)

Affects all users:
Some files did not check for authentication and could disclose some info.
Better checks before including files from user input

* git mv html/includes/ includes/html
git mv html/pages/ includes/html/

includes/html/graphs/device/netscaler_tcp_conn.inc.php

@@ -0,0 +1,22 @@
+<?php
+
+$rrd_filename = rrd_name($device['hostname'], 'netscaler-stats-tcp');
+
+$ds_in  = 'CurClientConn';
+$ds_out = 'CurServerConn';
+
+$in_text  = 'Client';
+$out_text = 'Server';
+
+$colour_area_in  = '88FF88';
+$colour_line_in  = '008800';
+$colour_area_out = 'FF8888';
+$colour_line_out = '880000';
+
+$colour_area_in_max  = 'cc88cc';
+$colour_area_out_max = 'FFefaa';
+
+$graph_max = 1;
+$unit_text = 'Connections';
+
+require 'includes/html/graphs/generic_duplex.inc.php';