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.

mods/d2k/rules/misc.yaml

@@ -3,7 +3,7 @@ crate:
 	Tooltip:
 		Name: Crate
 	Crate:
-		Lifetime: 120
+		Duration: 3000
 		TerrainTypes: Sand, Rock, Transition, Spice, SpiceSand, Dune, Concrete
 	GiveCashCrateAction@1:
 		Amount: 750