Revert "Introducing the PreferenceDrawerActivity which makes use of the new navigation drawer UI google has introduced in updates to many of their apps.  This relies on headers which are displayed in the drawer and preference fragments as the main content."

This reverts commit b9dc92a193b00b51d7a933db7a5db51ecd0030cc.

Change-Id: I6b1d8400a7170d73e411f7c691e1ce8cd0510834
cleanup duplicate