Initial Spokes Wrapper C++ for Plantronics SDK v3.x

* Version 1.5.29:
* Date: 12th Dec 2014
* Compatible with Spokes SDK version(s): 3.3.50873.10888 (pre-release)
* Changed by: Lewis Collins
*   Changes:
*     - Initial version of C++ wrapper for Plantronics SDK v3.x, matches
2.x C++ Wrapper version 1.0.8
*       Also has near feature parity with C# Wrapper 1.5.29, so adopting
same version number
*     - NOTE: define Preprocessor Definition: newDASeries if you want to
use the new DA Series
*       Quickdisconnect QD events (Connected/Disconnected)