This rev. is the first part (out of 3) of the refactoring of the
ActionManager and ViewManager layer of the webclient.
The main changes are:
- there is no ViewManager anymore, its work is now handled by the
ActionManager itself, but isolated in a specific file ; this
eases a lot of things, as the breadcrumbs handling for example.
- the ActionManager code is converted to the new coding principles
and guidelines ; mainly, children widgets communicate with it by
triggering events up, and not by function calls anymore.
- the ActionManager layer is now testable, and a lot of tests have
already been written.
- the code in other addons has been adapted consequently.
What's coming next:
- introduce the 'AbstractAction' Widget, and make client actions
and view controllers inherit from it ; this widget will
implement a common API that could be used uniformly by the
ActionManager (e.g. restore(), canBeLeft(), renderButtons(),
getTitle()...).
- move the ControlPanel handling from the ActionManager to the
AbstractAction.