Link includes in query language

[rubendel]

It would be useful to have the ability to link includes from within includes (but not on the fields).

For example the following could be simplified:

Now:

       "IfcOpenShell": {
         "type": "IfcOpenShell",
         "field": "CfsFaces",
         "include": {
            "type": "IfcFace",
            "field": "Bounds",
            "include": {
               "type": "IfcFaceBound",
               "field": "Bound",
               "include": {
                  "type": "IfcPolyLoop",
                  "field": "Polygon"
               }
            }
         }
      },
      "IfcClosedShell": {
         "type": "IfcClosedShell",
         "field": "CfsFaces",
         "include": {
            "type": "IfcFace",
            "field": "Bounds",
            "include": {
               "type": "IfcFaceBound",
               "field": "Bound",
               "include": {
                  "type": "IfcPolyLoop",
                  "field": "Polygon"
               }
            }
         }
      }

After:

       "IfcConnectedFaceSet": {
         "type": "IfcConnectedFaceSet",
         "field": "CfsFaces",
         "include": {
            "type": "IfcFace",
            "field": "Bounds",
            "include": {
               "type": "IfcFaceBound",
               "field": "Bound",
               "include": {
                  "type": "IfcPolyLoop",
                  "field": "Polygon"
               }
            }
         }
       },
       "IfcOpenShell": {
         "type": "IfcOpenShell",
         "superinclude": "IfcConnectedFaceSet"
      },
      "IfcClosedShell": {
         "type": "IfcClosedShell",
         "superinclude": "IfcConnectedFaceSet"
      }

Obviously in this example the types could have been combined in "IfcConnectedFaceSet" anyways, but there are also examples where you'd want to simplify the queries but only link to 1 of x subtypes.