Add box3_gas map object

data/map_objects.json

@@ -868,6 +868,20 @@
       "DrawLast": true,
       "Flags": ["Outside", "OneWall"]
     },
+    {
+      "Name": "box3_gas",
+      "Pic": {
+        "Type": "Animated",
+        "Sprites": "box3_gas",
+        "TicksPerFrame": 16
+      },
+      "Wreck": "box3",
+      "Health": 20,
+      "DestroyGuns": [
+        "gas_poison_explosion"
+      ],
+      "Flags": ["Outside", "OneWall"]
+    },
     {
       "Name": "box3",
       "Pic": {

graphics/box3_gas_16x21.txt

@@ -0,0 +1,4 @@
+Adapted from Sci-Fi Object Set by Janna
+http://opengameart.org/content/sci-fi-object-set
+
+http://creativecommons.org/publicdomain/zero/1.0/

missions/Sand.cdogscpn/missions.json

@@ -232,7 +232,7 @@
 			"Density": 15
 		},
 		{
-			"MapObject": "box3",
+			"MapObject": "box3_gas",
 			"Density": 10
 		},
 		{
@@ -787,7 +787,7 @@
 			"Density": 20
 		},
 		{
-			"MapObject": "box3",
+			"MapObject": "box3_gas",
 			"Density": 15
 		},
 		{
@@ -848,4 +848,4 @@
 			"Max": 3
 		}
 	}]
-}
+}

missions/ogre.cdogscpn/missions.json

@@ -1566,7 +1566,7 @@
 			"Density": 10
 		},
 		{
-			"MapObject": "box3",
+			"MapObject": "box_metal_green",
 			"Density": 5
 		},
 		{
@@ -1684,7 +1684,7 @@
 			"Density": 10
 		},
 		{
-			"MapObject": "box3",
+			"MapObject": "box_metal_green",
 			"Density": 5
 		},
 		{