Moving some recents logic into the shared lib.

- Creating com.android.system.shared library with recents model code and
  corresponding recents tests
- Removing notion of blacklisted apps since that is now obsolete.

Bug: 67510855
Test: It builds, Recents runs

Change-Id: Ib1f5eefa6e4d4964366061246002509e2e15b19e
72 files changed