view_manager is a property that takes ownership of the view_manager
object. We are setting the parent in the setter which means, we should
actaully have one ref to the parent, and one from the caller, so we need
to unref one.
Differential Revision: https://phab.enlightenment.org/D9304
View is something that is expected in the context of MVVM, so using it somewhere else is
going to lead to some confusion. Spotlight does descrive the objective of all of this
widget in actually a more explicit way as they all give the spotlight to one sub widget
at a time.
I have also renamed the View_Manager to be just Manager as the View there wasn't useful.