Add getter for Event.BroadcastDisabled (#946)

In a pre-hook, the hook param is not reliable if multiple plugins have hooked the same event.

plugins/include/events.inc

@@ -56,6 +56,7 @@ typeset EventHook
 	//						this event has set the hook mode EventHookMode_PostNoCopy.
 	// @param name			String containing the name of the event.
 	// @param dontBroadcast	True if event was not broadcast to clients, false otherwise.
+	//						May not correspond to the real value. Use the property BroadcastDisabled.
 	// @return				Ignored for post hooks. Plugin_Handled will block event if hooked as pre.
 	///
 	function Action (Event event, const char[] name, bool dontBroadcast);
@@ -160,6 +161,7 @@ methodmap Event < Handle
 	// or HookEventEx callbacks.
 	property bool BroadcastDisabled {
 		public native set(bool dontBroadcast);
+		public native get();
 	}
 }
 
@@ -337,4 +339,4 @@ native void GetEventName(Handle event, char[] name, int maxlength);
  * @param dontBroadcast True to disable broadcasting, false otherwise.
  * @error               Invalid Handle.
  */
-native void SetEventBroadcast(Handle event, bool dontBroadcast);
+native void SetEventBroadcast(Handle event, bool dontBroadcast);