Allows placing cables on lattices. (#4984)

Adds a "sturdy" tile flag, that in the future could be used by construction/etc to figure out if it's safe to build on a tile. (For example water isn't space, but it's not a sturdy building surface!)

Content.Server/Power/Components/CablePlacerComponent.cs

@@ -46,7 +46,7 @@ namespace Content.Server.Power.Components
             var snapPos = grid.TileIndicesFor(eventArgs.ClickLocation);
             var tileDef = grid.GetTileRef(snapPos).Tile.GetContentTileDefinition();
 
-            if(!tileDef.IsSubFloor || tileDef.IsSpace)
+            if(!tileDef.IsSubFloor || !tileDef.Sturdy)
                 return false;
 
             foreach (var anchored in grid.GetAnchoredEntities(snapPos))

Content.Shared/Maps/ContentTileDefinition.cs

@@ -42,6 +42,7 @@ namespace Content.Shared.Maps
         public string ItemDropPrototypeName { get; } = "FloorTileItemSteel";
 
         [DataField("is_space")] public bool IsSpace { get; private set; }
+        [DataField("sturdy")] public bool Sturdy { get; private set; } = true;
 
         public void AssignTileId(ushort id)
         {

Resources/Prototypes/Tiles/space.yml

@@ -5,3 +5,4 @@
   friction: 0
   is_subfloor: true
   is_space: true
+  sturdy: false