[IMP] Web: Use of a ControlPanel in One2Many Fields

Creation of the One2ManyControlPanel template. The One2ManyControlPanel
can only contain action_buttons and a pager. Typically, in One2Many
Kanban, buttons are displayed (in edit mode) and in One2Many Lists,
the pager is displayed.

Improvement of all Views.buttons templates so that if there is no
button to render, it does not render an empty div. This was necessary
for Kanban buttons to prevent padding when there is no button
displayed. Changes in the other views were motivated by uniformity
concerns. This prevents to add empty div in the DOM as well.
Exception for FormView where the outer div is required for the option
footer_to_buttons to work.

This fixes a bug as the pager is now available in One2Many Lists, which
was not the case before, even if there were more than 80 items in the
list, i.e. some items were unreachable.

cp_bus argument in ViewManager init() is now required. If there is no
ControlPanel to communicate with, a dummy Bus should be given ot the
ViewManager.

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