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

* Tip are never destroyed when change view mode
* unbind methods
* mail: memory leak with unbind methods
* web: memory leak because 'ui-autocomplete' is never destroyed
* web_editor: memory leak for wrong unbind on destroy
* web: memory leak: must remove fileupload handler
* bus: memory leak: correctly debind handlers on window in bus.Bus
* remove handlers on switch buttons and views $buttons
* remove handlers on breadcrumbs
* web: memory leak: correctly debind handlers
* im_odoo_support: memory leak: remove fileupload handler odoo_support

Note: part of this commit was actually authored by aab

A traceback is generated when a user clicks on 'more' button in settings to see the pending invitations.
That was caused by a missing check condition.

backport of saas-13 commit 2fdf631

opw-689597

The class `oe-search-options`
has been renamed to `o_search_options`
at the revision
977db823c7c84e9edc7c8cf8384eb9cf47275b3a

See the full explanation of the bug fix here:
4601b044a6e4dbf162cfca9bf0be5ff2a21dd4f5q