Change Crate.Lifetime from 'seconds' to ticks

As far as I could tell, this was the last place that still
used 'seconds' instead of ticks, apart from
some sound notification intervals (which are better
converted to real [milli]seconds).

Also renamed ScaredyCat.PanicLength to PanicDuration for
consistency and easier finding.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -94,6 +94,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new RemoveResourceType(),
 				new ConvertBoundsToWDist(),
 				new RemoveSmokeTrailWhenDamaged(),
+				new ReplaceCrateSecondsWithTicks(),
 			})
 		};