3.0 - WIP - Added accessor method getView() to ViewVarsTrait.

Let me know if this seems worth pursing.

`AppView` allows setting defaults and then in controller you would use `$this->getView()->foo` to modify stuff as needed. `Controller::$helpers` and similar view related properties would be gone.
This is to ensure a new view instance is generated each time you call `render()`. If you don't you would get old view instance with viewvars and properties set from previous call.