cubicweb-wireit #2406743 improve wireit editor embeddability [validation pending]

it should not be necessary to have a special template to embed the wireit editor : a normal view should be able to include one.

done in0.2.0
load left0.000
closed by#36bee89f31da improve embeddability of the wireit editor, which can now be used as a normal view: it has no special template anymore (closes #2406743)