CSRF Protection (#235)

* Fix alert class name

* feature: csrf protection

* Cosmetics

* Fix token generate

* Admin Panel: changelogs csrf protection

* news/id route

* Refactor admin newses + add csrf

* Use admin.links instead

* Admin panel: Pages csrf

* Menus: better csrf + add success message on reset colors

* Plugins csrf

* Move definitions

* add info function, same as note($message)

* Update mailer.php

* Fix new page/news links

* clear_cache & maintenance csrf

* Formatting

* Fix news type

* Fix changelog link

* Add new changelog link

* More info to confirm dialog

* This is always true

system/templates/admin.mailer.html.twig

@@ -9,6 +9,7 @@
 		<h5 class="m-0">Mailer</h5>
 	</div>
 	<form id="form" method="post">
+		{{ csrf() }}
 		<div class="card-body">
 			<div class="form-group row">
 				<label for="mail_to">To: (enter email, or leave empty to all)</label>