cubicweb #2110265 rename / deprecate JSONController [validation pending]

JSonController is an historical name an is actually used to handle ajax queries. I propose to :

  • either simply rename JSonController to AjaxController,
  • or create an AjaxController with ajax __regid__, deprecate JSonController and make it redirect (internally) to AjaxController with a deprecation warning.
done in3.15.0
load left0.000
closed by#0a927fe4541b [controllers] deprecate JSonController and implement AjaxController / ajax-func registry (closes #2110265)