[REF] web_kanban: new redesigned kanban view

This commit introduces an almost completely rewritten kanban view. It
was necessary in order to be able to render a different DOM to match
the new design.

It basically has the same features as before, but will render a
different DOM.  Three main differences, API wise, should be noted:
* the way the kanban view components communicate has been changed.  It now
  uses events, and event bubbling.
* kanban records do not have access to the view, so every call to this.view
  should be updated
* kanban templates are no longer wrapped in a div, so they should have a
  single root element for better result.

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