N°4368 Fix CORB blocking regression (#598)

Don't send X-Content-Type-Options HTTP header for certain WebPage impl to workaround CORB blocking
To disable globally this new behavior introduced in 9865bf07, set the `security.enable_header_xcontent_type_options` config parameter to false

Thanks @Molkobain for the review !

core/config.class.inc.php

@@ -1320,6 +1320,14 @@ class Config
 			'source_of_value' => '',
 			'show_in_conf_sample' => false,
 		],
+		'security.enable_header_xcontent_type_options' => [
+			'type' => 'bool',
+			'description' => 'If set to false, iTop will stop sending the X-Content-Type-Options HTTP header. This header could trigger CORB protection on certain resources (JSON, XML, HTML, text) therefore blocking them.',
+			'default' => true,
+			'value' => '',
+			'source_of_value' => '',
+			'show_in_conf_sample' => false,
+		],
 		'behind_reverse_proxy' => [
 			'type' => 'bool',
 			'description' => 'If true, then proxies custom header (X-Forwarded-*) are taken into account. Use only if the webserver is not publicly accessible (reachable only by the reverse proxy)',