Jordan: Update file names

we no longer have a homeDetailViewController. TVNavigationController
handles the navigation between three views.

The root view starts off with GroupViewController (before:
homeDetailViewController) which shows list of groups.

When choosing a group, uses ProductionViewController (before:
GroupViewController) to show list of productions.

MainView is now MainStageView and MasterView is now HomeMasterView to
differentiate between the stage and master sidebar.

StageEditor is now DimensionsView to avoid confusion between editing
stage frames (in MainStageView) and editing the stage dimensions.