Construction recipes can specify if they should be build-able in… (#781)

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Shared/Construction/ConstructionPrototype.cs

@@ -21,6 +21,7 @@ namespace Content.Shared.Construction
         private string _id;
         private string _result;
         private string _placementMode;
+        private bool _canBuildInImpassable;
 
         /// <summary>
         ///     Friendly name displayed in the construction GUI.
@@ -37,6 +38,11 @@ namespace Content.Shared.Construction
         /// </summary>
         public SpriteSpecifier Icon => _icon;
 
+        /// <summary>
+        ///     If you can start building or complete steps on impassable terrain.
+        /// </summary>
+        public bool CanBuildInImpassable => _canBuildInImpassable;
+
         /// <summary>
         ///     A list of keywords that are used for searching.
         /// </summary>
@@ -81,6 +87,7 @@ namespace Content.Shared.Construction
             ser.DataField(ref _type, "objecttype", ConstructionType.Structure);
             ser.DataField(ref _result, "result", null);
             ser.DataField(ref _placementMode, "placementmode", "PlaceFree");
+            ser.DataField(ref _canBuildInImpassable, "canbuildinimpassable", false);
 
             _keywords = ser.ReadDataField<List<string>>("keywords", new List<string>());
             {