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

Purpose:
========

When user opens a wizard , the cursor should be placed in the first field which saves a click for the user.
Right now , in odoo the cursor is not coming in the first field by default.

Instantiate the Dialog with the optional dialog_size specified in
the action's context.

This comportement was added in the DebugManager to trigger an event.
As this event could be useful in other situations (e.g. studio), we trigger
the event directly in the ActionManager. By default, the WebClient does not
use this event but an handler is added to be overwritten.

This handler is overwritten in some widgets (DebugManager, Studio, etc.) that
requires the Systray items instances so we add them in ´widgets´ in the Systray Menu.

As the module dashboard uses multiple ActionManager, the event bubbling should be
avoided in this case.

Now that the debug URL parameter can be equal to "assets", the session
debug variable has to be updated to not only be true or false. Now, its
value is false if the debug parameter is not specified in the url and
a the URL parameter string value otherwise (or 1 if the value is an
empty string).

Also modify all redirection which kept the debug mode to also keep
=assets. Use the $.param.querystring function.

New value for the selection field 'target' of ir_actions_act_window which
forces the breadcrumbs to be cleared before executing the action.