Rename filter plugin to messaging, add broadcast command.

data/plugins/cmd/messaging/plugin.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<plugin>
+  <id>message</id>
+  <version>1</version>
+  <name>Messaging commands</name>
+  <description>Adds various message-related commands, such as enabling the server-side chat filter or broadcasting a message.</description>
+  <authors>
+    <author>Major</author>
+    <author>xEliqa</author>
+  </authors>
+  <scripts>
+    <script>filter.rb</script>
+    <script>broadcast.rb</script>
+  </scripts>
+  <dependencies />
+</plugin>