make the parachute animation optional

instead of hard-coding default sprite sequences

mods/ra/rules/defaults.yaml

@@ -177,6 +177,8 @@
 		InfDeaths: 6
 	Parachutable:
 		ParachuteOffset: 0,0,427
+		KilledOnImpassableTerrain: true
+		ParachuteSequence: parach
 
 ^Ship:
 	AppearsOnRadar:

mods/ra/rules/misc.yaml

@@ -60,6 +60,9 @@ CRATE:
 	Crate:
 		Lifetime: 120
 		TerrainTypes: Clear, Rough, Road, Water, Ore, Beach
+	Parachutable:
+		KilledOnImpassableTerrain: false
+		ParachuteSequence: parach
 	GiveCashCrateAction:
 		Amount: 1000
 		SelectionShares: 50