fix opengl version issue
not showning anything
a triangle : Qt OpenGL
pay attention to CoreProfile and CompatibilityProfile modes
Merge branch 'bugfix'

Conflicts:
	App/CMakeLists.txt
	App/GLWidget.cpp
	App/GLWidget.h
	App/main.cpp
	CMakeLists.txt
fix the opengl version bug
CoreProfile vs. CompabilityProfile