Add BattleMechs

Also sort some of the vehicle categories, and the vehicle
group itself.

media/attribution.js

@@ -24866,6 +24866,17 @@ const attributionData = {
                 "boeing"
             ]
         },
+        {
+            prefix: "./media/vehicles/BattleMechs",
+            all: "https://gamemodels3d.com/",
+            authors: [
+                "gamemodels3d",
+                "mechwarrior-online"
+            ],
+            owners: [
+                "mechwarrior-online"
+            ]
+        },
 
     ],
     people: {
@@ -32205,6 +32216,10 @@ const attributionData = {
             "name": "DrunkArcher",
             "url": "http://furaffinity.net/user/drunkarcher"
         },
+        "mechwarrior-online": {
+            "name": "MechWarrior Online",
+            "url": "https://mwomercs.com"
+        },
     }
 }