added OpenGL context

*Changed the init function to use opengl 3 context.
*Commented the loadgui function - it doesnt work with the opengl context
for some reason.
*Commented the 2 blitsurfaces in the cicle and the sdl function to
reload the window under them - uses opengl function to reload.
*Slinx now uses glew with OpenGL.
*To build add additional dependency for glew(glew32.lib for windows) and
OpenGL(opengl32.lib for windows).
*Moved SDL library files to "libs" folder.