Horizontal box layout, linux build added, still to config
	modified:   README.md
	new file:   StiGame/HorizontalBoxLayout.cpp
	new file:   StiGame/HorizontalBoxLayout.h
	modified:   StiGame/StiGame.cbp
	modified:   StiGame/Time.cpp
	modified:   StiGame/Viewport.cpp
	modified:   StiGame/Viewport.h