Button modification, new big font for style class, init sdl goes static
into viewport
	modified:   README.md
	modified:   StiGame/Button.cpp
	modified:   StiGame/Item.cpp
	modified:   StiGame/MStyle.cpp
	modified:   StiGame/MStyle.h
	modified:   StiGame/Style.cpp
	modified:   StiGame/Style.h
	modified:   StiGame/Viewport.cpp
	modified:   StiGame/Viewport.h