[IMP] web, *: add new Domain and Field selection widgets

* base_action_rule, gamification, mass_mailing

1) Create the independant DomainSelector widget

- Allow to build a prefix char domain

2) Replace old FieldCharDomain with a new FieldDomain which uses the
   new DomainSelector widget

3) Create the independant ModelFieldSelector widget

- Allow to build a valid field chain for a specific model
  (e.g 'partner_id.name' for a 'res.users')
- Used by DomainSelector widget

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The DomainSelector widget uses a tree-like representation with
user-friendly buttons (ALL/ANY/+/-/...). Any domain can be built,
except those containing the "!" (not) operator or some operators
like "like", "child_of" (@see DomainSelector). However, if the
user enters these in the debug input, the widget can handle them.

Note: these widgets had to do unusual stuff the widget API does not
allow to handle efficiently right now but it will be adapted to the
new widget/field API in a further update.

Note2: the widgets also have possibility of other improvements like
supporting m2o input instantiation in DomainLeaf, etc.

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This work is an adaptation of the original code made by @pga-odoo.

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