[forms] new optional suffix attribute on widget objects, used to generage input name / dom id. Ease reuse of widgets from another widget. Also move base values computing to a separated values(form, field) method.

introduce new _ensure_correctly_typed method on fields, responsible to ensure the value return by the widget is suitable for that kind of field. Also factorize date and time fields.

fix typed_value implementation w/ eidparam field which are actual entity's relation and have .value set for their initial value

cleanup module namespace but only importing the formwidgets module

fix deprecation warnings

fif inlined relation forms pb w/ new ajax forms. We've to ensure the varmaker is properly initialized when generating a form where we may add new subentities, which will use ajax call to generate the subform while this subform expect a varmaker to be set.

now that we are property initializing autoform_section for the 'inlined' form type, use it...

[uicfg] fix autoform_section rtags initialization 1. when a relation is marked as inlined in the 'main' form type, we want its opposite (eg when one the other side of the relation) to be marked as hidden in the 'inlined' form type 2. when no section is specified for the 'inlined' form type, use the same as in the 'main' form type to do this properly, we need two initialization stages. The first one to handle 1., the second to handle what was done before and 2. We can't do this in a single stage because we've to know the bare value of the "opposite" tag.