Add banners as default functionality & display them on mod login / dashboard when enabled (#513)

* Add banner support as a default, integrated option.
Used lainchan's original banner script, authored by barrucadu

* Display banners on moderator login and dashboard

* Remove memes & better directory structure

b.php

@@ -0,0 +1,19 @@
+<?php
+$dir = "static/banners/";
+$files = scandir($dir);
+$images = array_diff($files, array('.', '..'));
+$name = $images[array_rand($images)];
+// open the file in a binary mode
+$fp = fopen($dir . $name, 'rb');
+
+// send the right headers
+header('Cache-Control: no-cache, no-store, must-revalidate'); // HTTP 1.1
+header('Pragma: no-cache'); // HTTP 1.0
+header('Expires: 0'); // Proxies
+header('Content-Type: ' . $fp['type']);
+header('Content-Length: ' . $fp['bytes']);
+
+// dump the picture and stop the script
+fpassthru($fp);
+exit;
+?>

inc/config.php

@@ -1041,12 +1041,13 @@
 	// Characters used to generate a random password (with Javascript).
 	$config['genpassword_chars'] = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_+';
 
-	// Optional banner image at the top of every page.
-	// $config['url_banner'] = '/banner.php';
-	// Banner dimensions are also optional. As the banner loads after the rest of the page, everything may be
-	// shifted down a few pixels when it does. Making the banner a fixed size will prevent this.
-	// $config['banner_width'] = 300;
-	// $config['banner_height'] = 100;
+	// Banner settings.
+	// Banners are rotating, random images displayed to users at the top of thread pages and the catalog.
+	// You should upload your banners to static/banners.
+	$config['url_banner'] = '/b.php';	// Custom script may be used.
+	// Setting the banner dimensions stops the page shifting as it loads. If you have banners of various different sizes, unset these.
+	$config['banner_width'] = 300;
+	$config['banner_height'] = 100;
 
 	// Custom stylesheets available for the user to choose. See the "stylesheets/" folder for a list of
 	// available stylesheets (or create your own).

templates/mod/dashboard.html

@@ -1,3 +1,4 @@
+{% if config.url_banner %}<img class="board_image" src="{{ config.url_banner }}" {% if config.banner_width or config.banner_height %}style="{% if config.banner_width %}width:{{ config.banner_width }}px{% endif %};{% if config.banner_width %}height:{{ config.banner_height }}px{% endif %}" {% endif %}alt="" />{% endif %}
 <fieldset>
 	<legend>{% trans 'Boards' %}</legend>
 	

templates/mod/login.html

@@ -1,4 +1,5 @@
 {% if error %}<h2 style="text-align:center">{{ error }}</h2>{% endif %}
+{% if config.url_banner %}<img class="board_image" src="{{ config.url_banner }}" {% if config.banner_width or config.banner_height %}style="{% if config.banner_width %}width:{{ config.banner_width }}px{% endif %};{% if config.banner_width %}height:{{ config.banner_height }}px{% endif %}" {% endif %}alt="" />{% endif %}
 <form action="" method="post">
 <table style="margin-top:25px;">
 	<tr>