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/pf_removals.inc.php

@@ -0,0 +1,16 @@
+<?php
+
+$rrd_filename = rrd_name($device['hostname'], 'pf_removals');
+
+$ds = 'removals';
+
+$colour_area = '9999cc';
+$colour_line = '0000cc';
+
+$colour_area_max = '9999cc';
+
+$graph_max = 1;
+
+$unit_text = 'Removals';
+
+require 'includes/html/graphs/generic_simplex.inc.php';