cubicweb #3005509 [wsgi] have the simplest wsgi server possible [validation pending]

This would be a first step towards generalized wsgi use.

Next step would be to provide whatever is necessary to work with any wsgi compliant server (mod_wsgi, mongrel2, tornado, werkzeug....).

done in3.18.0
load left0.000
closed by#e70c8c70e344 [wsgi] add the simplest possible wsgi (debug) server
patch[wsgi] also provide an example using werkzeug (if available) [applied]wsgi: add a simple server wsgi with all-in-one capability [applied]