Refactor view switcher to simplify it; treat it
as a representation of a domain object that modifies
an ng-model. This simplifies reuse, e.g. in frames
within a layout. WTD-535.
Use ng-model when communicating state to/from the
tree in browse mode. This will simplify implementation
of the Locator control, which also uses a tree, but
which should not set navigation state. WTD-593.
Reorganize templates associated with the Create menu in
preparation for adding the Locator control, used to
specify the destination folder for object creation.
WTD-593.
Add a general-purpose controller for UI elements which
have 'click-away' behavior; that is, they should be
deactivated on document clicks.
This generalizes existing behavior added for the Create
menu, such that it may be used on other, similar menus
and UI elements.
Part of ongoing transition of common user interface
components, WTD-574.
