feat(modules): add Broadcast Filter to hide Ascension Autobroadcast spam

New Chatter module registers a ChatFrame message filter that suppresses chat
lines matching a configurable list (default: 'Ascension Autobroadcast'). Matches
case-insensitively against the message body and every string arg, so it catches
the named-channel autobroadcast where the label is the channel name, not the
body. Editable list in the module's options; enabled by default.

Chatter/modules.xml

@@ -7,6 +7,7 @@
 	<Script file="Modules\PlayerNames.lua" />
 	<Script file="Modules\StickyChannels.lua" />
 	<Script file="Modules\UrlCopy.lua" />
+	<Script file="Modules\BroadcastFilter.lua" />
 	<!-- <Script file="Modules\ChatLink.lua" /> //-->
 	<Script file="Modules\EditBox.lua" />
 	<Script file="Modules\ChatFont.lua" />