Use real (milli)seconds for notifications

Allows for more fine-grained control, while
adding independence from gamespeed and getting
rid of magic * 25 multiplications.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -95,6 +95,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new ConvertBoundsToWDist(),
 				new RemoveSmokeTrailWhenDamaged(),
 				new ReplaceCrateSecondsWithTicks(),
+				new UseMillisecondsForSounds(),
 			})
 		};