Simplify tileset-specific sequence definitions.

All magic behaviour for constructing sprite filenames
has been removed in favour of an explicit Filename
(and TilesetFilenames for tileset-specific sequences)
property.

mods/ra/maps/bomber-john/sequences.yaml

@@ -1,9 +1,12 @@
 miner:
 	idle:
+		Filename: miner.shp
 		Length: *
 		Tick: 400
 		ZOffset: -512
-	icon: jmin
+	icon:
+		Filename: jmin.shp
 
 brick:
 	idle:
+		Filename: brick.shp

mods/ra/maps/drop-zone-w/sequences.yaml

@@ -1,8 +1,12 @@
 lst:
-	muzzle: minigun
+	Defaults:
+		Filename: lst.shp
+	muzzle:
+		Filename: minigun.shp
 		Start: 0
 		Length: 6
 		Facings: 8
-	turret: mgun
+	turret:
+		Filename: mgun.shp
 		Start: 0
 		Facings: 32

mods/ra/maps/fort-lonestar/sequences.yaml

@@ -1,4 +1,6 @@
 sniper:
+	Defaults:
+		Filename: sniper.shp
 	stand:
 		Facings: 8
 	stand2:
@@ -66,24 +68,24 @@ sniper:
 		Start: 452
 		Length: 18
 		Tick: 80
-	die6: electro
+	die6:
+		Filename: electro.tem
+		TilesetFilenames:
+			SNOW: electro.sno
 		Frames: 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
 		Length: *
 		Tick: 80
-		UseTilesetExtension: true
-		TilesetOverrides:
-			DESERT: TEMPERAT
-			INTERIOR: TEMPERAT
-	die-crushed: corpse1
+	die-crushed:
+		Filename: corpse1.tem
+		TilesetFilenames:
+			SNOW: corpse1.sno
 		Length: 6
 		Tick: 1600
 		ZOffset: -511
-		UseTilesetExtension: true
-		TilesetOverrides:
-			DESERT: TEMPERAT
-			INTERIOR: TEMPERAT
-	garrison-muzzle: minigun
+	garrison-muzzle:
+		Filename: minigun.shp
 		Length: 3
 		Stride: 6
 		Facings: 8
-	icon: snipericon
+	icon:
+		Filename: snipericon.shp

mods/ra/maps/oil-spill/sequences.yaml

@@ -1,4 +1,5 @@
 oilb.husk: oilb
-	idle: oilb
+	idle:
+		Filename: oilb.shp
 		Start: 1
 		Offset: 0,-6