Move ConnectedSensor from KinectManager class.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C41917
Move SkeletonTrackingType to separate file.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS15]$/Atomix;C41918