change "class" for something closer to IFC

[janbrouwer]

We for now describe the ifc entity type of an object as:

• "Class": "IfcWall"

This is ok, but maybe something else would be more IFC like?

• "entity": "IfcWall" (from STEP schema)
• "ifcType": "IfcWall" (from EIR, although type seems more like basic types like LIST, BOOL etc.)

Or to align with geojson?

• "feature": "IfcWall"

Or from cityJSON(would that work with JSON-SCHEMA?)

• "type": "IfcWall"

[pipauwel]

I would like to avoid to introduce again the relatively awkward distinction between Types and Entities in JSON, if possible. As far as I am concerned, "type": "IfcWall" seems to be the better option.

[janbrouwer]

Decision: "type"