Added minimizer factory, moved minimizers into subdirectory. Modified CMakeLists accordingly. Purged CMinimizerThread in favor of C++11 threads (not yet implemented.
Missing include in CModel.h
Enabled main UI minimizer combo box, added GetID function to subclasses of CMinimizer. Re-added common UI functions in gui_common.h.
Added code to launch minimizer using std::thread (instead of QThreads) from CGLWidget container class.