Reeti Integration into Always-On: Revision 1

-> The switch implementation for Agent/Reeti/Both Face Tracking 
(shutdown yet to be implemented)

-> FaceDetection modularity for Agent/Reeti/Both so that a single FaceDetection dll is used

-> FaceDetection DLL VS Solution in always/core

-> Deleting FaceTracking C++ code as it's no longer required. Instead, Java Client and PIDRealizer added to the java side.

-> FaceTracking implemented in Java using the above additional realizers to eliminate the need for another dll/executable simply for face tracking