This commit introduce a full redesign of all JS views.  We started
basically from scratch.  The goal was to unify all the various views
under a common framework, to make them testable, to make then usable in
different conditions (in studio, or in the frontend), and to make our
lives easier.

Some important points are:
- we introduced new coding guidelines (camelCase, 80 chars width, ...)
- we have a brand new testing framework (still QUnit based)
- kanban view moved to the web addon
- calendar view (formerly web_calender) moved to web as well
- the tree view was removed
- all new code should be documented

We hope that this code is the start of a new era for the Odoo web
client, we want to have a high quality codebase, well documented, well
tested, well designed.

Work done by the framework team: mostly aab, ged, chm, dmo, qsm

ir.needaction_mixin is not used anymore by the webclient.
From 9.0, the concept has changed: this feature is now
available in mail module, with the mail.thread mixin,
and message_neeadction field.

Remove all code handeling needaction bullet and
counter on ir.ui.menu, knowing that since 9.0
webclient does not display the counter anymore.

This code was, thus, useless and some RPC calls
were done for nothing, and adapt accounting
reconcialiation widget.

This is done by guarding the `on_hashchange` evant handler with the
`clear_uncommitted_changes` function.

Note that the url has already changed when we are in this handler, so we
make sure to restore the old url when the user chose to continue its
edition.

Wrong class selector and must add '#' to force the browser to reload the picture because the picture is in the cache with the previous cache informations.

Try to bind event without wait the action deferred