added amb1685 - GetTickInterval()

--HG--
branch : sourcemod-1.0.x
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/branches/sourcemod-1.0.x%402213

plugins/include/timers.inc

@@ -152,6 +152,15 @@ native bool:GetMapTimeLimit(&time);
  */
 native bool:ExtendMapTimeLimit(time);
 
+/**
+ * Returns the number of seconds in between game server ticks.
+ *
+ * Note: A tick, in this context, is a frame.
+ *
+ * @return					Number of seconds in between ticks.
+ */
+native Float:GetTickInterval();
+
 /**
  * Notification that the map's time left has changed via a change in the time 
  * limit or a change in the game rules (such as mp_restartgame).  This is useful