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