ContactManager: Standardize class definition.
ContactManager: Standardize class definition.

- Moved public xxxInterface methods definition to the end of the public methods
  declaration.
- Added friend struct Private declaration.
- Added Q_DISABLE_COPY(xxx) to all classes that can not be copied.
- Moved Q_DISABLE_COPY(xxx) declaration to the top of the class definition,
  before the public keyword.
- Reorder public, protected, SIGNALS declaration as follows:
   public
   public Q_SLOTS
   Q_SIGNALS
   protected
   protected Q_SLOTS
   private Q_SLOTS
   private
- Moved friend class xxx definitions to be placed right bellow private keyword.

TelepathyIM/telepathy-qt,detrout/telepathy-qt,anantkamath/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt,tiagosh/telepathy-qt,special/telepathy-qt-upstream,special/telepathy-qt-upstream,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,TelepathyIM/telepathy-qt,special/telepathy-qt-upstream,anantkamath/telepathy-qt,tiagosh/telepathy-qt,detrout/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,TelepathyQt/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,anantkamath/telepathy-qt,TelepathyQt/telepathy-qt,TelepathyIM/telepathy-qt,TelepathyQt/telepathy-qt,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,detrout/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt4