[uicfg] uicfg.py moves from web/ to web/views/ (prepares #2406609)
We are about to make uicfg selectable. Registrable / selectable views
and helpers live in web/views. Hence the move.
Backward compat is put in place. However CubicWeb imports of uicfg are
updated to the new location.
Latest changes
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* table of `all latest changes`_
Links below is providing useful RQL query example.
.. _all latest changes: view?rql=Any+M%2CX+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30