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
diff --git a/packages/SystemUI/Android.mk b/packages/SystemUI/Android.mk
index 2fd7e87..2c5eb27 100644
--- a/packages/SystemUI/Android.mk
+++ b/packages/SystemUI/Android.mk
@@ -31,6 +31,7 @@
 
 LOCAL_STATIC_ANDROID_LIBRARIES := \
     SystemUIPluginLib \
+    SystemUISharedLib \
     android-support-v4 \
     android-support-v7-recyclerview \
     android-support-v7-preference \