correctly export boxes, avoid adding "undefined" as css class, handle type-legacy conversion, export select fields
correctly export boxes, avoid adding "undefined" as css class, handle type-legacy conversion, export select fields

breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval