Ensuring that we fire the right intent when going home from Recents.

- Refactoring RecentsAppWidgetHost
- Removing some references to the RecentsActivity from the RecentsPackageMonitor
- Fixing the memory leak related to long references to activities
- Working around blank screen when going home from Recents

Change-Id: I7b0ad219b8da197795864a3b90fd02f3a3c1a4ef
7 files changed