Move Account & sync settings into Settings app.

Fragmentized some of the activities and moved buttons into the menu area.

Bug: 3148844
diff --git a/proguard.flags b/proguard.flags
index 7cd46e7..8318101 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -9,4 +9,5 @@
 -keep class com.android.settings.inputmethod.*
 -keep class com.android.settings.MasterClear
 -keep class com.android.settings.MasterClearConfirm
+-keep class com.android.settings.accounts.*