* Header guard cleanup (making sure naming is compliant with C++ standards and consistent).
* Removing un-needed nullptr checks.
* Removing SSE warnings for x64 builds (as SSE is enabled by default no need for a flag)
* Reverting Mat deletion
- Adding a new boost version (1.63)
- Decoupling FaceAnalyser from LandmarkDetector
- FaceAnalyser is much easier to load with a parameters class
- Moving GazeAnalyser as a separate library
- GUI now uses new FaceAnalyser, LandmarkDetector, and GazeAnalyser