Fix large TS visceroid attack and enable attack animation

Unfortunately the animation sprite starts at an unusual facing, so we have to work around that by manually fixing the order. Using Combine is easier than listing a whopping 40 frames in the correct order.

mods/ts/sequences/infantry.yaml

@@ -526,12 +526,19 @@ vislrg:
 		ShadowStart: 90
 		Tick: 80
 		Offset: 0, 0, 16
-	muzzle: vislgatk # TODO: unused
+	attack:
+		Combine:
+			vislgatk:
+				Start: 5
+				Length: 35
+			vislgatk:
+				Start: 0
+				Length: 5
+		Facings: -8
 		Length: 5
-		Facings: 8
-		ShadowStart: 40
 		Tick: 80
 		Offset: 0, 0, 16
+#		ShadowStart: 40 # TODO: enable shadow frames
 
 flameguy:
 	Defaults: