Not worrying about styling yet, just functionality. Added an InnerView
interface that these views can implement. Currently it asks them to
populate the menu. It may be slightly inefficient if we end up with a
popup menu, because it is called onPrepareOptionsMenu, but expects the
inner view to inflate the menu. However, for swap this shouldn't be an
issue, as all the menus pretty much fit in the action bar of most screen
sizes.
* Provide CheckBox for selected items
Newer API's highlight the background using the "activated" state. Older
APIs need this to be implemented differently, so there are now checkboxes
on the left of the list view items to provide this functionality.
* Clean up IDE warnings
Diamond operator for generics, remove unused imports and unused method.
* Adapter class created for installed apps
Cleaned up the code to do with binding views to the adapter in this view.
Previously it made quite a few assumptions about the structure of the layout,
e.g. "layout.getParent().getParent() is a LinearLayout", which would cause
crashes if the layout changed slightly.
