Limit roomintro size

Roomintros are now limited to 200 vertical pixels, with a
scrollbar for any roomintro that doesn't fit.

An exception is given to official rooms under modchat, namely the
Help room. It is expected that other official rooms won't abuse
this exception, but we can deal with that separately if it becomes
an issue.

commands.js

@@ -353,7 +353,7 @@ var commands = exports.commands = {
 		if (!target) {
 			if (!this.canBroadcast()) return;
 			if (!room.introMessage) return this.sendReply("This room does not have an introduction set.");
-			this.sendReplyBox(room.introMessage);
+			this.sendReply('|raw|<div class="infobox infobox-limited">' + room.introMessage + '</div>');
 			if (!this.broadcasting && user.can('declare', null, room)) {
 				this.sendReply('Source:');
 				this.sendReplyBox('<code>' + Tools.escapeHTML(room.introMessage) + '</code>');
@@ -371,7 +371,7 @@ var commands = exports.commands = {
 		if (!target.trim()) target = '';
 		room.introMessage = target;
 		this.sendReply("(The room introduction has been changed to:)");
-		this.sendReplyBox(target);
+		this.sendReply('|raw|<div class="infobox infobox-limited">' + target + '</div>');
 
 		this.privateModCommand("(" + user.name + " changed the roomintro.)");
 

rooms.js

@@ -1475,15 +1475,21 @@ var ChatRoom = (function () {
 		this.send(update);
 	};
 	ChatRoom.prototype.getIntroMessage = function () {
-		var html = this.introMessage || '';
+		if (this.modchat && this.introMessage) {
+			return '\n|raw|<div class="infobox"><div' + (!this.isOfficial ? ' class="infobox-limited"' : '') + '>' + this.introMessage + '</div>' +
+				'<br />' +
+				'<div class="broadcast-red">' +
+				'Must be rank ' + this.modchat + ' or higher to talk right now.' +
+				'</div></div>';
+		}
+
 		if (this.modchat) {
-			if (html) html += '<br /><br />';
-			html += '<div class="broadcast-red">';
-			html += 'Must be rank ' + this.modchat + ' or higher to talk right now.';
-			html += '</div>';
+			return '\n|raw|<div class="infobox"><div class="broadcast-red">' +
+				'Must be rank ' + this.modchat + ' or higher to talk right now.' +
+				'</div></div>';
 		}
 
-		if (html) return '\n|raw|<div class="infobox">' + html + '</div>';
+		if (this.introMessage) return '\n|raw|<div class="infobox infobox-limited">' + this.introMessage + '</div>';
 
 		return '';
 	};